Bump actions/checkout from 3 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...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/update_dicm2nii.yml

@@ -17,10 +17,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout gannet repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v5
 
       - name: Checkout dicm2nii repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v5
         with:
           repository: xiangruili/dicm2nii
           path: dicm2nii_tmp/

.github/workflows/update_export_fig.yml

@@ -17,10 +17,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout gannet repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v5
 
       - name: Checkout export_fig repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v5
         with:
           repository: altmany/export_fig
           path: export_fig_tmp/