ci: doc: use ubuntu-24.04 image

So that workflows run as of date.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>

Author: gmarull

.github/workflows/docbuild.yml

@@ -25,7 +25,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     concurrency:
       group: ${{ github.workflow }}-${{ github.ref }}
       cancel-in-progress: true

.github/workflows/docpublish.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   publish:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     if: ${{ github.event.workflow_run.conclusion == 'success' }}
     steps:
       - name: Download artifacts

.github/workflows/docremove.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   remove:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Try removal of PR-docs
         env: