Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/add-stars.yml

@@ -6,7 +6,7 @@ jobs:
   addstars:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: add watcher to readme
       run: |
         echo -e "\nWe got a :star: from [@${{github.actor}}](https://github.com/${{github.actor}})" >> README.md 

.github/workflows/bootstrap.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Create Issue From File
       uses: peter-evans/create-issue-from-file@v4.0.1
       env:

.github/workflows/comment-run.yml

@@ -7,7 +7,7 @@ jobs:
   comment-run:
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         # 0 indicates all history
         fetch-depth: 0

.github/workflows/label-commenter.yml

@@ -14,7 +14,7 @@ jobs:
   comment:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: master