Fix automated version update

.github/workflows/ci.yml

@@ -22,8 +22,10 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
 
-    - name: Set up Go
+    - name: Set up Go v1.21.4
       uses: actions/setup-go@v5
       with:
         go-version: '1.21.4'
@@ -89,10 +91,9 @@ jobs:
       run: |
         git config user.name 'github-actions[bot]'
         git config user.email 'github-actions@github.com'
-        git fetch
         git checkout main
-        git add version.go
-        if [[ $(git diff) != "" ]]; then
+        if [[ $(git diff version.go) != "" ]]; then
+          git add version.go
           git commit -m "[CI] Bump version to $VERSION"
           git push -u origin main
         fi