fix: use github runners

Author: hvoigt

.github/workflows/cicd.yaml

@@ -11,7 +11,7 @@ jobs:
       contents: write
       id-token: write
       actions: read
-    runs-on: jimdo-runner-1core
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
         with:

.github/workflows/commitlint.yaml

@@ -2,7 +2,7 @@ name: Lint Commit Messages
 on: [pull_request]
 jobs:
   commitlint:
-    runs-on: jimdo-runner-1core
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
         with: