Added Gemfile.lock to git add files when calling update-ruby.sh (face…

…book#33484)

Summary:
In https://github.com/facebook/react-native/blob/main/scripts/update-ruby.sh#L61

```bash
bundle lock
```

is called which creates a Gemfile.lock in the rn root. This file should be in the git add files list along with the other files that get updated by that script.

## Changelog

[Internal] [Fixed] - Added Gemfile.lock to git add files when calling update-ruby.sh

Pull Request resolved: facebook#33484

Test Plan: Call update-ruby.sh with or without this patch. Without this patch, the Gemfile.lock will not be staged, with this patch, the Gemfile.lock will be staged.

Reviewed By: GijsWeterings

Differential Revision: D35118250

Pulled By: cortinico

fbshipit-source-id: 80f2c7fad6fbc3f09697988dcc20f7ac94a21473

scripts/update-ruby.sh

@@ -63,5 +63,6 @@ bundle lock
 git add \
     .ruby-version \
     Gemfile \
+    Gemfile.lock \
     template/_ruby-version \
     template/Gemfile