Bump actions/upload-artifact from 6 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v6...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/build.yml

@@ -45,7 +45,7 @@ jobs:
                 run: php ./iconify app:build iconify --build-version=${{ steps.tag.outputs.tag }} --ansi
 
             -   name: Upload artifact
-                uses: actions/upload-artifact@v6
+                uses: actions/upload-artifact@v7
                 with:
                     name: iconify
                     path: builds/iconify

.github/workflows/publish-phar.yml

@@ -56,7 +56,7 @@ jobs:
                     sudo php ./iconify app:build iconify.phar --build-version=${{ steps.tag.outputs.tag }}
 
             -   name: Upload the PHAR artifact
-                uses: actions/upload-artifact@v6
+                uses: actions/upload-artifact@v7
                 with:
                     name: iconify.phar
                     path: builds/iconify.phar