[CP-beta]Don't use git add -N in the sync engine workflow. (flutter#185130)

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### Issue Link:
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### Impact Description:
Release workflow for bumping the engine version is broken.

### Changelog Description:
This does not require a changelog since this is a workflow change.

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Author: flutteractionsbot

.github/workflows/sync-engine-version.yml

@@ -52,9 +52,8 @@ jobs:
       - name: Check for Changes
         id: git-check
         run: |
-          # -N (intent-to-add) treats untracked files as existing but empty
           # -f adds even if it's in the .gitignore (which it usually is)
-          git add -N -f bin/internal/engine.version
+          git add -f bin/internal/engine.version
 
           if git diff --cached --exit-code bin/internal/engine.version; then
             echo "changed=false" >> $GITHUB_OUTPUT