Bump mukunku/tag-exists-action from 1.2.0 to 1.4.0

Bumps [mukunku/tag-exists-action](https://github.com/mukunku/tag-exists-action) from 1.2.0 to 1.4.0.
- [Release notes](https://github.com/mukunku/tag-exists-action/releases)
- [Commits](mukunku/tag-exists-action@v1.2.0...v1.4.0)

---
updated-dependencies:
- dependency-name: mukunku/tag-exists-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/master-workflow.yaml

@@ -44,7 +44,7 @@ jobs:
           msg: ${{ steps.pubspecVersion.outputs.version }}
           separator: '+'
       - name: Validate that version doesn't exists
-        uses: mukunku/tag-exists-action@v1.2.0
+        uses: mukunku/tag-exists-action@v1.4.0
         id: checkTag
         with:
           tag: ${{ steps.split.outputs._0 }}