chore: bump version to 1.5.6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [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/v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  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/pio-dependabot.yaml

@@ -15,7 +15,7 @@ jobs:
     name: run PlatformIO Dependabot
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: run PlatformIO Dependabot
         uses: peterus/platformio_dependabot@v1.2.0
         with:

platformio.ini

@@ -14,7 +14,7 @@ extra_configs = secrets.default.ini
 core_dir = .pio
 
 [env]
-version = 1.5.5
+version = 1.5.6
 framework = arduino
 lib_deps = 
 	bblanchon/ArduinoJson@^7.3.0