Fix: GitHub Actions の ubuntu-20.04 Runner の廃止に対応

Author: tsukumijima

.github/workflows/build.yml

@@ -9,7 +9,9 @@ on:
 jobs:
 
   build-linux:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
+    container:
+      image: ubuntu:20.04
     steps:
 
       - name: Checkout Repository
@@ -54,7 +56,7 @@ jobs:
           path: dist/isdb_scanner-*.whl
 
   build-linux-arm:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
 
       - name: Set up QEMU
@@ -117,7 +119,7 @@ jobs:
   # build-linux と build-linux-arm のジョブが完了し、かつタグが push されたときのみ実行
   release:
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     needs:
       - build-linux
       - build-linux-arm