`deno deploy` adds an extra trailing blank line to `deno.jsonc` on every run

# `deno deploy` adds an extra trailing blank line to `deno.jsonc` on every run

## Description

Running `deno deploy` modifies `deno.jsonc` by appending an extra blank line at the end of the file.

Every subsequent deployment adds one more blank line, so the trailing blank lines keep accumulating.

The deployment itself succeeds.

## Steps to reproduce

1. Create a `deno.jsonc` whose file ending contains only the normal final newline.

2. Run:

```bash
deno deploy --prod
```

3. Check `deno.jsonc`.

An additional blank line has been appended to the end of the file.

4. Run the same command again:

```bash
deno deploy --prod
```

Another blank line is appended.

This happens on every deployment.

## Expected behavior

`deno deploy` should not modify `deno.jsonc` when no configuration changes are required.

At minimum, it should preserve the existing trailing newline / blank-line formatting.

## Actual behavior

Each invocation adds one additional trailing blank line:

```text
First deploy: +1 blank line
Second deploy: +1 blank line
Third deploy: +1 blank line
...
```

This creates an unnecessary Git diff and causes the file to accumulate blank lines over time.

## Environment

```bash
deno --version
```

Output:

```text
deno 2.9.5 (stable, release, aarch64-apple-darwin)
v8 15.0.245.2-rusty
typescript 6.0.3
```

## Additional context

This appears related to the configuration rewrite behavior of `deno deploy`.

A similar issue involving unnecessary rewriting/formatting of the deploy section was reported here:

denoland/deno#32524

Start by reproducing the issue with a minimal deno.jsonc and repeated `deno deploy --prod` runs, then inspect the resulting diff. Trace the configuration rewrite behavior referenced in the issue and compare it with denoland/deno#32524. Done means deployments that require no configuration changes leave deno.jsonc unchanged and preserve its existing trailing formatting.

Written by the indexing model from the issue text.