Bump actions/upload-artifact from 4 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  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/excel_inbox.yaml

@@ -153,7 +153,7 @@ jobs:
 
       - name: Upload apply output (for PR comment in finish job)
         if: steps.inbox_check.outputs.present == 'true'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: apply-output
           path: /tmp/apply_output.md
@@ -163,7 +163,7 @@ jobs:
         if: >
           steps.inbox_check.outputs.present == 'true' &&
           steps.apply.outcome != 'failure'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: modified-schema
           path: _main_branch/src/coremeta4cat/schema/