Bump actions/checkout from 4 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
     name: NFCLocatorCore (SwiftPM)
     runs-on: macos-15
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - name: Select Xcode
         run: sudo xcode-select -s /Applications/Xcode.app
       - name: swift build (debug)
@@ -33,7 +33,7 @@ jobs:
     name: NFCLocatorCore (iOS Simulator via xcodebuild)
     runs-on: macos-15
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - name: Select Xcode
         run: sudo xcode-select -s /Applications/Xcode.app
       - name: List available simulators
@@ -49,7 +49,7 @@ jobs:
     name: TapSense (sample app)
     runs-on: macos-15
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - name: Select Xcode
         run: sudo xcode-select -s /Applications/Xcode.app
       - name: Install XcodeGen
@@ -94,7 +94,7 @@ jobs:
     name: NFCLocatorCore.podspec (pod lib lint)
     runs-on: macos-15
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - name: Select Xcode
         run: sudo xcode-select -s /Applications/Xcode.app
       - name: pod lib lint