Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/backwards-compatibility.yml

@@ -14,7 +14,7 @@ jobs:
 
         steps:
             - name: "Checkout"
-              uses: "actions/checkout@v4"
+              uses: "actions/checkout@v5"
               with:
                   fetch-depth: 0
 

.github/workflows/docs.yml

@@ -13,7 +13,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v5
 
             - uses: ./.github/workflows/build-jekyll-site-action
               with:

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v5
 
             - uses: shivammathur/setup-php@v2
               with:
@@ -48,7 +48,7 @@ jobs:
                       composer-flags: '--ignore-platform-req=php'
 
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v5
               with:
                 fetch-depth: 0
 
@@ -78,7 +78,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v5
 
             - uses: shivammathur/setup-php@v2
               with:
@@ -96,7 +96,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v5
 
             - uses: shivammathur/setup-php@v2
               with:
@@ -114,7 +114,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v5
 
             - uses: shivammathur/setup-php@v2
               with:
@@ -135,7 +135,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v5
 
             - uses: github/super-linter/[email protected]
               env: