fix CI

Author: mulle-nat

Diff for: .github/workflows/dockerfile-ci.yml

@@ -5,7 +5,7 @@ on: [push,workflow_dispatch]
 
 jobs:
   build:
-   runs-on: ubuntu-latest
+   runs-on: ubuntu-24.04
 
    steps:
      - uses: actions/checkout@v4

Diff for: .github/workflows/mulle-sde-ci.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ ubuntu-latest]
+        os: [ ubuntu-24.04 ]
 
     steps:
     - name: Set MULLE_HOSTNAME

Diff for: src/mulle-objc/github-actions/project/all/.github/workflows/mulle-sde-ci.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ ubuntu-latest] # macos-latest,
+        os: [ ubuntu-24.04 ] # macos-latest,
 
     steps:
     - name: Set MULLE_HOSTNAME