Update to Ubuntu 24.04 runner because of 20.04 deprecation

Author: ice-phoenix

.github/workflows/build-spec-on-pr-in-docker.yml

@@ -4,7 +4,7 @@ on: [pull_request]
 
 jobs:
   build-spec:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - name: 'Checkout'
         uses: actions/checkout@v3

.github/workflows/build-spec-on-pr.yml

@@ -4,7 +4,7 @@ on: [pull_request]
 
 jobs:
   build-spec:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout repo
         uses: actions/checkout@v3