package maintenance

- update to TS6
- replace ncc by rollup, which seems to now be the recommended workflow according to <https://github.com/actions/typescript-action>
- remove buildjet provider, as they are shutting down, see <https://buildjet.com/for-github-actions/blog/we-are-shutting-down>

.github/workflows/warpbuild.yml

@@ -1,18 +1,18 @@
-name: buildjet
+name: warpbuild
 
 on: [push, pull_request]
 
 permissions: {}
 
 jobs:
-  buildjet:
+  warpbuild:
     if: github.repository == 'Swatinem/rust-cache'
     strategy:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
 
-    name: Test buildjet provider on ${{ matrix.os }}
+    name: Test warpbuild provider on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
 
     env:
@@ -28,7 +28,7 @@ jobs:
       - uses: ./
         with:
           workspaces: tests
-          cache-provider: buildjet
+          cache-provider: warpbuild
 
       - run: |
           cargo check