fix: ci workflows using deprecated ubuntu version

Author: negrel

.github/workflows/push.yaml

@@ -8,7 +8,7 @@ on:
 jobs:
   push:
     if: "! contains(github.ref, 'refs/tags/')"
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     env:
       GENENV_FILE: ./config/genenv.ci.sh
     steps:

.github/workflows/release.yaml

@@ -4,7 +4,7 @@ on:
     types: ["published"]
 jobs:
   release:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - uses: cachix/install-nix-action@v24
       - name: Check out repository code