Bump actions/checkout from 4 to 5

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](actions/checkout@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] <[email protected]>

Author: dependabot[bot]

.github/workflows/publish.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-24.04
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Check Cargo.toml version vs Git tag
         if: startsWith(github.ref, 'refs/tags/v')
         working-directory: ./light-curve
@@ -60,7 +60,7 @@ jobs:
             cibw_build: cp39-musllinux_aarch64
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           submodules: true
 
@@ -114,7 +114,7 @@ jobs:
         working-directory: ./light-curve
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Setup Python
         uses: actions/setup-python@v5
@@ -171,7 +171,7 @@ jobs:
         working-directory: light-curve-python
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Python
         uses: actions/setup-python@v5

.github/workflows/test.yml

@@ -14,7 +14,7 @@ jobs:
         working-directory: light-curve
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           submodules: true
       - name: Set up Python 3.13
@@ -45,7 +45,7 @@ jobs:
         working-directory: light-curve
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           submodules: true
       - name: Set up Rust toolchain
@@ -73,7 +73,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up Rust toolchain
         uses: dtolnay/rust-toolchain@master
         with:
@@ -84,7 +84,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up Rust toolchain
         uses: dtolnay/rust-toolchain@master
         with:
@@ -109,7 +109,7 @@ jobs:
         working-directory: light-curve
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           submodules: true
       - uses: dtolnay/rust-toolchain@master
@@ -154,7 +154,7 @@ jobs:
     needs: [ py_build_deps ]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: stable
@@ -188,7 +188,7 @@ jobs:
         working-directory: light-curve
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up Python 3.9
         uses: actions/setup-python@v5
         with: