feat: Update version verification in checkout workflow

This commit updates the `checkout.yml` workflow file to improve the version verification step. It modifies the commands to extract the version numbers from the `pubspec.yaml` and `pubspec.yaml.g.dart` files using the `grep` and `awk` commands. Additionally, it uses the `sed` command to remove any non-printable characters from the extracted version numbers. This ensures that the comparison between the two versions is accurate. The updated workflow now prints the version numbers and exits with a non-zero status code if they don't match.

.github/workflows/checkout.yml

@@ -72,8 +72,8 @@ jobs:
       - name: 👀 Verify versions
         timeout-minutes: 1
         run: |
-          version_pubspec=$(grep '^version:' pubspec.yaml | awk '{print $2}' | tr -d '[:space:]')
-          version_g_dart=$(grep 'representation: r' lib/src/model/pubspec.yaml.g.dart | awk -F"'" '{print $2}' | tr -d '[:space:]')
+          version_pubspec=$(grep '^version:' pubspec.yaml | awk '{print $2}' | sed 's/[^[:print:]]//g')
+          version_g_dart=$(grep 'representation: r' lib/src/model/pubspec.yaml.g.dart | awk -F"'" '{print $2}' | sed 's/[^[:print:]]//g')
 
           echo "Version from pubspec.yaml: '$version_pubspec'"
           echo "Version from pubspec.yaml.g.dart: '$version_g_dart'"