Ruby: missing version.rb file in release

### TL;DR

After migration from v3 to v4, Release-Please-Action not found ``version.rb`` in a Ruby Gem:
`file lib//version.rb did not exist`

### Expected behavior

Using ``ruby`` as release type, release please should edit the following files:
- ``lib//version.rb``
- ``CHANGELOG.md``
- ``.release-please-manifest.json``

### Observed behavior

Using ``ruby`` as release type, release please edit the following files:
- ``CHANGELOG.md``
- ``.release-please-manifest.json``

But - ``lib//version.rb`` is not take into consideration

### Action YAML

```yaml
name: Ruby

on:
push:
branches:
- main

permissions:
checks: write
statuses: write
contents: write
packages: write
pull-requests: write

jobs:
build:
runs-on: ubuntu-latest

steps:
- name: release please
uses: google-github-actions/release-please-action@v4
id: release
with:
release-type: ruby
```

### Log output

```text
Run google-github-actions/release-please-action@v4
Running release-please version: 16.5.0
✔ Looking for latest release on branch: main with prefix:
❯ Fetching merge commits on branch main with cursor: undefined
❯ Fetching releases with cursor undefined
⚠ Could not find releases.
❯ found 0 possible releases. []
❯ found 0 possible tags. []
✔ Building releases
✔ Building strategies by path
❯ .: ruby
✔ Looking for latest release on branch: main with prefix:
❯ Fetching merge commits on branch main with cursor: undefined
❯ Fetching releases with cursor undefined
⚠ Could not find releases.
❯ found 0 possible releases. []
❯ found 0 possible tags. []
✔ Building pull requests
✔ Building strategies by path
❯ .: ruby
✔ Collecting release commit SHAs
❯ release search depth: 400
❯ Fetching releases with cursor undefined
⚠ Could not find releases.
⚠ Expected 1 releases, only found 0
⚠ Missing 1 paths: .
⚠ No version for path .
⚠ Expected 1 releases, only found 0
✔ Collecting commits since all latest releases
❯ commit search depth: 500
❯ Set(0) {}
❯ Fetching merge commits on branch main with cursor: undefined
❯ Backfilling file list for commit: b22db61f488ec58a90fedfc4c3734ae989e7295e
❯ Found 2 files
❯ Backfilling file list for commit: e27eea4f62065e31fabfcce75bd5cb177b61063f
❯ Found 1 files
❯ Backfilling file list for commit: e7e05a193ffe70c318262a7467f2b2ebfd536142
❯ Found 1 files
❯ Backfilling file list for commit: f4211f5e03fc515754762c0ac218c3a841f61528
❯ Found 1 files
❯ Backfilling file list for commit: fa590c3b474c4bfe9fc74807355a3cb4a814573f
❯ Found 1 files
❯ Backfilling file list for commit: f89ba8381f7d39bc82586e65da15cb8a682a9411
❯ Found 2 files
❯ Backfilling file list for commit: af05bcdaa9ad6e3b46ed273363ef207dd57bf8c4
❯ Found 2 files
❯ Backfilling file list for commit: 8ac144c592e2d2a86fe21c02c44cd1e67a6609bd
❯ Found 1 files
❯ Backfilling file list for commit: 9bdd323e458da6932d193c93b065d2a2bfdfe5fa
❯ Found 1 files
❯ Backfilling file list for commit: 6003ec9cdd28d09e231382b0b7a4b7fabd91f5b9
❯ Found 11 files
✔ Splitting 10 commits by path
✔ Building candidate release pull request for path: .
❯ type: ruby
❯ targetBranch: main
❯ commit could not be parsed: f89ba8381f7d39bc82586e65da15cb8a682a9411 Merge pull request #2 from 0xdbe/release-please/bootstrap/default
❯ commits: 9
⚠ No latest release pull request found.
✔ Considering: 9 commits
❯ component:
❯ pull request title pattern: undefined
✔ Looking for open release pull requests
✔ found 1 open release pull requests.
✔ Looking for snoozed release pull requests
✔ found 0 snoozed release pull requests.
❯ Fetching CHANGELOG.md from branch main
❯ Fetching lib//version.rb from branch main
⚠ file lib//version.rb did not exist
❯ Fetching Gemfile.lock from branch main
❯ Fetching .release-please-manifest.json from branch main
✔ Starting GitHub PR workflow...
✔ Successfully found branch HEAD sha "b22db61f488ec58a90fedfc4c3734ae989e7295e".
✔ Skipping branch creation step...
✔ Got the latest commit tree
✔ Successfully created a tree with the desired changes with SHA 7aeac424e24d062c233b5932b37cc107bc30d8f2
✔ Successfully created commit. See commit at https://api.github.com/repos/0xdbe/foodie/git/commits/cc917052ab3e36db0b0f8d22f1d1dadbcfafc89d
✔ Updating reference heads/release-please--branches--main to cc917052ab3e36db0b0f8d22f1d1dadbcfafc89d
✔ Successfully updated reference release-please--branches--main to cc917052ab3e36db0b0f8d22f1d1dadbcfafc89d
✔ Found existing pull request for reference 0xdbe:release-please--branches--main. Skipping creating a new pull request.
✔ Successfully opened pull request: 1.
```

### Additional information

Configuration file:

```
{
"release-type": "ruby",
"packages": {
".": {
"changelog-path": "CHANGELOG.md",
"release-type": "ruby",
"component": "foodie",
"package-name": "foodie",
"version-file": "lib/foodie/version.rb",
"bump-minor-pre-major": false,
"bump-patch-for-minor-pre-major": false,
"draft": false,
"prerelease": false
}
},
"$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json"
}
```

Repository for demonstration purpose: https://github.com/0xdbe/foodie

Start with the Ruby release-type configuration and the Action workflow shown in the issue; reproduce the v4 run against the linked foodie repository and inspect how version-file is resolved. Done means the release PR fetches and updates lib/foodie/version.rb alongside CHANGELOG.md and .release-please-manifest.json, without the lib//version.rb lookup.

Written by the indexing model from the issue text.