Duplicate timestamp in the output of "bazel version"

### Description of the bug:

Output:

Bazelisk version: v1.28.1
Build label: 8.6.0
Build target: @@//src/main/java/com/google/devtools/build/lib/bazel:BazelServer
Build time: Thu Feb 26 19:55:20 2026 (1772135720)
Build timestamp: **1772135720**
Build timestamp as int: **1772135720**

### Which category does this issue belong to?

_No response_

### What's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

_No response_

### Which operating system are you running Bazel on?
Linux

### What is the output of `bazel info release`?
release 8.6.0

### If `bazel info release` returns `development version` or `(@non-git)`, tell us how you built Bazel.

_No response_

### What's the output of `git remote get-url origin; git rev-parse HEAD` ?

```text

```

### If this is a regression, please try to identify the Bazel commit where the bug was introduced with bazelisk --bisect.

_No response_

### Have you found anything relevant by searching the web?
No

### Any other information, logs, or outputs that you want to share?

_No response_