Bump actions/checkout from 5 to 6

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](actions/checkout@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>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -43,7 +43,7 @@ jobs:
       # try and build for all devices even if one fails
       fail-fast: false 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - uses: actions/setup-python@v6
@@ -82,7 +82,7 @@ jobs:
       # try and build for all devices even if one fails
       fail-fast: false 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0    
     - uses: actions/setup-python@v6
@@ -120,7 +120,7 @@ jobs:
       # try and build for all devices even if one fails
       fail-fast: false 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - uses: actions/setup-python@v6
@@ -159,7 +159,7 @@ jobs:
       # try and build for all devices even if one fails
       fail-fast: false 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - name: make ${{ matrix.board }}
@@ -194,7 +194,7 @@ jobs:
       # try and build for all devices even if one fails
       fail-fast: false 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - name: make ${{ matrix.board }}