CI: use Ubuntu 24.04

now that it's out of beta at Github

.github/workflows/modified_scripts_build.yml

@@ -157,7 +157,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ${{fromJson(needs.discover_modified_scripts.outputs.versions)}}
-        os: ["ubuntu-20.04", "ubuntu-22.04"]
+        os: ["ubuntu-20.04", "ubuntu-22.04", "ubuntu-24.04"]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
@@ -215,7 +215,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ${{fromJson(needs.discover_modified_scripts.outputs.versions_cpython_only)}}
-        os: ["ubuntu-20.04", "ubuntu-22.04"]
+        os: ["ubuntu-20.04", "ubuntu-22.04", "ubuntu-24.04"]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4

.github/workflows/ubuntu_build.yml

@@ -15,7 +15,7 @@ jobs:
           - "3.11"
           - "3.12"
           - "3.13"
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       # Normally, we would use the superbly maintained...