Update parent POM, switch to Renovate, enable dep automerge (#282)

Signed-off-by: Olivier Lamy <olamy@apache.org>

Author: olamy

.github/dependabot.yml

@@ -0,0 +1,6 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "github>jenkinsci/renovate-config"
+  ]
+}

.github/renovate.json

@@ -1,9 +1,9 @@
 name: Automatically approve and merge safe dependency updates
 on:
-  - pull_request_target
+- pull_request_target
 permissions:
   contents: write
   pull-requests: write
 jobs:
   auto-merge-safe-deps:
-    uses: jenkins-infra/github-reusable-workflows/.github/workflows/auto-merge-safe-deps.yml@v1
+    uses: jenkins-infra/github-reusable-workflows/.github/workflows/auto-merge-safe-deps.yml@v1

.github/workflows/auto-merge-safe-deps.yml

@@ -2,10 +2,10 @@ name: Close BOM update PR if passing
 on:
   check_run:
     types:
-      - completed
+    - completed
 permissions:
   contents: read
   pull-requests: write
 jobs:
   close-bom-if-passing:
-    uses: jenkins-infra/github-reusable-workflows/.github/workflows/close-bom-if-passing.yml@v1
+    uses: jenkins-infra/github-reusable-workflows/.github/workflows/close-bom-if-passing.yml@v1