ci: bump actions/checkout from 2.4.0 to 3

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.4.0 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.4.0...v3)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/build_documentation.yaml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       # check out the ModularSensors repo
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
         with:
           path: code_docs/ModularSensors
 
@@ -59,7 +59,7 @@ jobs:
 
       # check out my fork of m.css, for processing Doxygen output
       - name: Checkout m.css
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v3
         with:
           # Repository name with owner. For example, actions/checkout
           repository: SRGDamia1/m.css

.github/workflows/build_examples_arduino_cli.yaml

@@ -36,7 +36,7 @@ jobs:
           ]
 
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
 
       - name: Set environment variable for library installation source
         run: |

.github/workflows/build_examples_platformio.yaml

@@ -28,7 +28,7 @@ jobs:
         pio_environment: [mayfly, mega, arduino_zero, adafruit_feather_m0, autonomo]
 
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
 
       - name: Set environment variable for library installation source
         run: |

.github/workflows/build_menu.yaml

@@ -182,7 +182,7 @@ jobs:
             sensorFlag: NO_SENSORS
             publisherFlag: BUILD_PUB_THINGSPEAK
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
 
       - name: Set environment variable for library installation source
         run: |

.github/workflows/changelog_reminder.yaml

@@ -5,7 +5,7 @@ jobs:
     name: Changelog Reminder
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
         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@v2.4.0
+        uses: actions/checkout@v3
 
       - name: Set environment variable for current library version
         run: |

.github/workflows/verify_library_json.yaml

@@ -9,7 +9,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, 'ci skip')"
 
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
 
       - name: Set up Python
         uses: actions/setup-python@v3