GitHub Actions updates (#554)

* Bump actions/add-to-project to v1.0.1

This _might_ address the failed workflow runs dating back to at least
the last six months:

https://github.com/maxgoedjen/secretive/actions/workflows/add-to-project.yml

* Bump actions/upload-artifact to v4

This should get rid of the deprecation notices displayed as annotations
beneath each Nightly job run. See:

https://github.com/maxgoedjen/secretive/actions/runs/9461831554

* Bump actions/upload-artifact to v4

Similar to cf25db6, this should silence some deprecation notices.

.github/workflows/nightly.yml

@@ -48,7 +48,7 @@ jobs:
             shasum -a 256 Secretive.zip
             shasum -a 256 Archive.zip
     - name: Upload App to Artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: Secretive.zip
         path: Secretive.zip