feat: bump actions/checkout from 5 to 6 (#172)

Author: dependabot[bot]

.github/workflows/check-variables.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Load environment variables for testing
         uses: rlespinasse/github-slug-action@v5

.github/workflows/linter.yml

@@ -15,7 +15,7 @@ jobs:
       statuses: write
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # Full git history is needed to get a proper
           # list of changed files within `super-linter`

.github/workflows/v5-tests-and-release.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Load this action from HEAD
         uses: ./
@@ -94,7 +94,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           path: this-action
           ref: ${{ github.ref }}
@@ -122,7 +122,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Load this action from HEAD
         uses: ./
@@ -207,7 +207,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           path: this-action
           ref: ${{ github.ref }}
@@ -230,7 +230,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # Test 1
       - name: Using correct short length
@@ -269,7 +269,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           path: this-action
           ref: ${{ github.ref }}
@@ -323,7 +323,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # Test 1
       - name: Using correct slug max length
@@ -395,7 +395,7 @@ jobs:
       - input-slug-maxlength
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Release this GitHub Action
         uses: rlespinasse/release-that@v1
         with: