Support Unreal Engine 5.6

Author: nutti

.github/workflows/lint.yaml

@@ -16,7 +16,7 @@ jobs:
     name: plugin-clang-format
     runs-on: ubuntu-latest
     container:
-      image: ubuntu:latest
+      image: ubuntu:20.04
     steps:
       - name: Checkout repo
         uses: actions/checkout@v2
@@ -34,7 +34,7 @@ jobs:
     name: sample-clang-format
     runs-on: ubuntu-latest
     container:
-      image: ubuntu:latest
+      image: ubuntu:20.04
     steps:
       - name: Checkout repo
         uses: actions/checkout@v2
@@ -82,7 +82,7 @@ jobs:
 
   yamllint:
     name: yamllint
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
         uses: actions/checkout@v2
@@ -100,7 +100,7 @@ jobs:
 
   shellcheck:
     name: shellcheck
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
         uses: actions/checkout@v2