update checkout and stylua-action versions

Author: ellisonleao

.github/workflows/default.yml

@@ -7,8 +7,8 @@ jobs:
     name: stylua
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: JohnnyMorganz/stylua-action@1.0.0
+      - uses: actions/checkout@v3
+      - uses: JohnnyMorganz/stylua-action@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           args: --color always --check lua
@@ -21,7 +21,7 @@ jobs:
     name: test
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - uses: rhysd/action-setup-vim@v1
         with:
@@ -30,5 +30,3 @@ jobs:
 
       - name: run tests
         run: make test
-        env:
-          PLENARY_DIR: vendor/plenary.nvim