ci: move workflows to rocky9

Author: anwayde

.github/workflows/builds.yml

@@ -92,7 +92,7 @@ concurrency:
 jobs:
   build_gcc:
     runs-on:
-      labels: rocky8
+      labels: rocky9
       group: fd-public-repo
     if: ${{ inputs.gcc != 'none' }}
     steps:

.github/workflows/doxygen.yml

@@ -8,7 +8,7 @@ jobs:
     timeout-minutes: 20
     name: Doxygen
     runs-on:
-      labels: rocky810
+      labels: rocky9
       group: fd-public-repo
     environment:
       name: doxygen