Build(deps): Bump WyriHaximus/github-action-helm3 from 3 to 4

Bumps [WyriHaximus/github-action-helm3](https://github.com/wyrihaximus/github-action-helm3) from 3 to 4.
- [Release notes](https://github.com/wyrihaximus/github-action-helm3/releases)
- [Commits](WyriHaximus/github-action-helm3@v3...v4)

---
updated-dependencies:
- dependency-name: WyriHaximus/github-action-helm3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/tags.yml

@@ -256,17 +256,17 @@ jobs:
       # See more here: https://artifacthub.io/docs/topics/annotations/helm/#supported-annotations
 
       - name: Package helm chart with vX.Y.Z
-        uses: WyriHaximus/github-action-helm3@v3
+        uses: WyriHaximus/github-action-helm3@v4
         with:
           exec: helm package --app-version $RELEASE_VERSION --version "${RELEASE_VERSION}" --destination ./gh-pages helm/mail
 
       - name: Package helm chart with X.Y.Z
-        uses: WyriHaximus/github-action-helm3@v3
+        uses: WyriHaximus/github-action-helm3@v4
         with:
           exec: helm package --app-version "${RELEASE_VERSION_NO_v}" --version "${RELEASE_VERSION_NO_v}" --destination ./gh-pages helm/mail
 
       - name: Create helm chart index
-        uses: WyriHaximus/github-action-helm3@v3
+        uses: WyriHaximus/github-action-helm3@v4
         with:
           exec: cd gh-pages && rm -rf .git && helm repo index . --url https://bokysan.github.io/docker-postfix