ci: bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/build_documentation.yaml

@@ -36,7 +36,7 @@ jobs:
     name: Check that all classes are documented in the menu-a-la-carte example
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python
         uses: actions/setup-python@v4
@@ -84,7 +84,7 @@ jobs:
 
     steps:
       # check out the ModularSensors repo
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           path: code_docs/ModularSensors
 
@@ -124,7 +124,7 @@ jobs:
 
       # check out my fork of m.css, for processing Doxygen output
       - name: Checkout m.css
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           # Repository name with owner. For example, actions/checkout
           repository: SRGDamia1/m.css

.github/workflows/build_examples.yaml

@@ -17,7 +17,7 @@ jobs:
       pio_job_matrix: ${{ steps.py_matrix.outputs.pio_job_matrix }}
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python
         uses: actions/setup-python@v4
@@ -62,7 +62,7 @@ jobs:
       library_install_git: ${{ steps.store_vars.outputs.library_install_git }}
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set environment variables for pushes to any branch in EnviroDIY/ModularSensors
         if: github.event_name == 'push'
@@ -115,7 +115,7 @@ jobs:
         job_info: ${{ fromJSON(needs.generate_matrix.outputs.arduino_job_matrix) }}
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Unused Step
         run: echo "This is needed to make the step number match with the PlatformIO jobs. =)"
@@ -185,7 +185,7 @@ jobs:
         job_info: ${{ fromJSON(needs.generate_matrix.outputs.pio_job_matrix) }}
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python
         uses: actions/setup-python@v4

.github/workflows/changelog_reminder.yaml

@@ -5,7 +5,7 @@ jobs:
     name: Changelog Reminder
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           persist-credentials: false # otherwise, the token used is the GITHUB_TOKEN, instead of your personal token
 

.github/workflows/prepare_release.yaml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set environment variable for current library version
         run: |

.github/workflows/verify_library_structure.yaml

@@ -14,7 +14,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, 'ci skip')"
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python
         uses: actions/setup-python@v4
@@ -60,7 +60,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, 'ci skip')"
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Run Arduino-Lint to verify the library structure and syntax for the Arduino IDE
         id: validate_library