update github runners (#64)

Author: ahl

.github/workflows/rust.yml

@@ -11,7 +11,7 @@ on:
 
 jobs:
   check-style:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     steps:
     # actions/checkout@v2
     - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938
@@ -27,7 +27,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ ubuntu-20.04, macos-11 ]
+        os: [ ubuntu-latest, macos-latest ]
     steps:
     # actions/checkout@v2
     - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938