Use ubuntu-latest

.github/workflows/pr.yml

@@ -4,14 +4,14 @@ on: [pull_request]
 
 jobs:
   clang-format:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
     - name: clang-format
       run: |
         docker run --rm -v ${PWD}:/src ghcr.io/wiiu-env/clang-format:13.0.0-2 -r ./source ./include
   build-lib:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     needs: clang-format
     steps:
     - uses: actions/checkout@v3

.github/workflows/push_image.yml

@@ -10,7 +10,7 @@ env:
 
 jobs:
   build-and-push-image:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     permissions:
       contents: read
       packages: write