chore: update github actions runner OS

Author: dfireBird

.github/workflows/deploy.yml

@@ -6,7 +6,7 @@ on:
       - deploy
 jobs:
   deploy:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
 

.github/workflows/main.yml

@@ -10,7 +10,7 @@ on:
 
 jobs:
   deploy:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2