Bump actions/checkout from 5 to 6 (#1156)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/lint.yml

@@ -12,14 +12,14 @@ jobs:
   pre-commit:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/setup-python@v6
     - uses: pre-commit/action@v3.0.1
 
   scan-build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Create LLVM clang-tools scan-build Workspace
       run: |
         sudo apt-get update -qq
@@ -32,7 +32,7 @@ jobs:
   splint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Create SPLint Workspace
       run: |
         sudo apt-get update -qq
@@ -44,7 +44,7 @@ jobs:
   cppcheck:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Create CPPcheck Workspace
       run: |
         sudo apt-get update -qq
@@ -58,7 +58,7 @@ jobs:
   flawfinder:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Create Flawfinder Workspace
       run: |
         sudo apt-get update -qq
@@ -72,7 +72,7 @@ jobs:
   codespell:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Create codespell Workspace
       run: |
         sudo apt-get update -qq
@@ -83,7 +83,7 @@ jobs:
   unittest:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Create Build Environment
       run: |
         sudo apt-get update -qq
@@ -95,9 +95,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout BACnet Stack
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Checkout libwebsockets
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: warmcat/libwebsockets
         ref: v4.3-stable