chore(deps): bump actions/checkout from 6 to 7 (#55)

Author: dependabot[bot]

.github/workflows/sdk-pr.yaml

@@ -28,7 +28,7 @@ jobs:
           java-version: ${{ env.JAVA_VERSION }}
 
       - name: Checkout generator repo
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           repository: "stackitcloud/stackit-sdk-generator"
           ref: "main"
@@ -72,7 +72,7 @@ jobs:
           java-version: ${{ env.JAVA_VERSION }}
 
       - name: Checkout generator repo
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           repository: "stackitcloud/stackit-sdk-generator"
           ref: "main"
@@ -124,7 +124,7 @@ jobs:
           java-version: ${{ env.JAVA_VERSION }}
 
       - name: Checkout generator repo
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           repository: "stackitcloud/stackit-sdk-generator"
           ref: "main"