Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/chart-lint.yaml

@@ -9,7 +9,7 @@ jobs:
   chart-lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: azure/[email protected]
         with:
           version: 3.19.2

.github/workflows/fleet-bundles.yaml

@@ -12,7 +12,7 @@ jobs:
   fleet-bundles:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - run: |
           sudo curl -sL https://github.com/rancher/fleet/releases/download/v0.11.7/fleet-linux-amd64 -o /bin/fleet

.github/workflows/fleet-symlinks.yaml

@@ -9,7 +9,7 @@ jobs:
   fleet-symlinks:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up Go
         uses: actions/setup-go@v6

.github/workflows/markdownlint.yaml

@@ -9,7 +9,7 @@ jobs:
   markdownlint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Run mdl
         uses: actionshub/markdownlint@main

.github/workflows/shellcheck.yaml

@@ -9,7 +9,7 @@ jobs:
   shellcheck:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@master

.github/workflows/yamllint.yaml

@@ -9,7 +9,7 @@ jobs:
   yamllint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Run yamllint
         uses: bewuethr/yamllint-action@v1