refactor: fix git commit line

Author: jsjoeio

ci/build/release-prep.sh

@@ -91,7 +91,7 @@ main() {
   # Updates the svg to be green for the badge
   $CMD sd "red.svg" "green.svg" ../../README.md
 
-  $CMD git add . && $CMD git commit -am "chore(release): bump version to $CODE_SERVER_VERSION_TO_UPDATE"
+  $CMD git commit -am "chore(release): bump version to $CODE_SERVER_VERSION_TO_UPDATE"
 
   # Note: we need to set upstream as well or the gh pr create step will fail
   # See: https://github.com/cli/cli/issues/575