ci: update release-please-action to v4 (#429)

.github/release-please-config.json

@@ -0,0 +1,15 @@
+{
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
+  "bootstrap-sha": "359539fdd65b3a8849f7ea783cddc700c399c78c",
+  "include-component-in-tag": false,
+  "include-v-in-tag": false,
+  "draft-pull-request": true,
+  "packages": {
+    ".": {
+      "release-type": "simple",
+      "package-name": "hetzner.hcloud",
+      "changelog-path": "changelogs/dev-changelog.md",
+      "extra-files": ["galaxy.yml", "plugins/module_utils/version.py"]
+    }
+  }
+}

.github/release-please-manifest.json

@@ -0,0 +1 @@
+{".":"2.4.1"}

.github/workflows/release-please.yml

@@ -1,41 +1,26 @@
+name: Release-please
+
 on:
   push:
-    branches:
-      - main
-
-name: release-please
+    branches: [main]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
 jobs:
   release-please:
-    # The secret HCLOUD_BOT_TOKEN is only available on the main repo, not in forks.
+    # Do not run on forks.
     if: github.repository == 'ansible-collections/hetzner.hcloud'
 
     runs-on: ubuntu-latest
-    outputs:
-      pr-updated: ${{ steps.outputs.outputs.pr-updated }}
-      branch: ${{ steps.outputs.outputs.branch }}
-      version: ${{ steps.outputs.outputs.version }}
-
     steps:
       - id: release
-        uses: google-github-actions/release-please-action@v3
+        uses: google-github-actions/release-please-action@v4
         with:
           token: ${{ secrets.HCLOUD_BOT_TOKEN }}
-          release-type: simple
-          package-name: hetzner.hcloud
-          include-v-in-tag: false
-          draft-pull-request: true
-
-          # We use antsibull-changelog for the actual user-facing changelog.
-          changelog-path: changelogs/dev-changelog.md
-
-          extra-files: |
-            galaxy.yml
-            plugins/module_utils/version.py
+          config-file: .github/release-please-config.json
+          manifest-file: .github/release-please-manifest.json
 
       - name: Prepare outputs
         id: outputs
@@ -45,10 +30,16 @@ jobs:
           echo "branch=${{ fromJSON(steps.release.outputs.pr).headBranchName }}" >> "$GITHUB_OUTPUT"
           echo "version=$(echo "${{ fromJSON(steps.release.outputs.pr).title }}" | awk '{print $3}')" >> "$GITHUB_OUTPUT"
 
+    outputs:
+      pr-updated: ${{ steps.outputs.outputs.pr-updated }}
+      branch: ${{ steps.outputs.outputs.branch }}
+      version: ${{ steps.outputs.outputs.version }}
+
   antsibull-changelog:
-    runs-on: ubuntu-latest
     needs: [release-please]
     if: needs.release-please.outputs.pr-updated
+
+    runs-on: ubuntu-latest
     steps:
       - name: Setup python
         uses: actions/setup-python@v5