ci: switch to releaser-pleaser (#230)

Replace release-please with releaser-pleaser, as 0.7.0 adds support for
updating package.json

Author: apricote

.github/release-please-config.json

@@ -0,0 +1,27 @@
+name: Releaser-pleaser
+
+on:
+  push:
+    branches: [main]
+  pull_request_target:
+    types:
+      - edited
+      - labeled
+      - unlabeled
+
+concurrency:
+  group: releaser-pleaser
+  cancel-in-progress: true
+
+jobs:
+  releaser-pleaser:
+    # Do not run on forks.
+    if: github.repository == 'hetznercloud/setup-hcloud'
+
+    runs-on: ubuntu-latest
+    steps:
+      - name: releaser-pleaser
+        uses: apricote/[email protected]
+        with:
+          token: ${{ secrets.HCLOUD_BOT_TOKEN }}
+          updaters: packagejson