Update actions/checkout action to v3

Author: renovate-bot

.github/workflows/backward-compatibility.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v2"
+        uses: actions/checkout@v3
         with:
           fetch-depth: 0
 

.github/workflows/build.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v2"
+        uses: actions/checkout@v3
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
@@ -53,7 +53,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v2"
+        uses: actions/checkout@v3
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
@@ -93,7 +93,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v2"
+        uses: actions/checkout@v3
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
@@ -133,7 +133,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v2"
+        uses: actions/checkout@v3
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v2"
+        uses: actions/checkout@v3
 
       - name: Generate changelog
         id: changelog