chore(deps): update actions/checkout action to v3

Author: renovate[bot]

.github/workflows/php.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Update composer
       run: composer update

.github/workflows/pr.yml

@@ -5,7 +5,7 @@ jobs:
     name: Conventional PR
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions/setup-node@v2-beta
       - uses: beemojs/conventional-pr-action@v2
         env: