Fix integration tests by downgrading jobserver (#5673) (#5674)

Author: tustvold

.github/workflows/integration.yml

@@ -95,6 +95,11 @@ jobs:
         with:
           path: rust
           fetch-depth: 0
+      # Workaround https://github.com/rust-lang/jobserver-rs/issues/87
+      # Can be removed once https://github.com/rust-lang/jobserver-rs/pull/88 is released
+      - name: Downgrade jobserver
+        working-directory: rust
+        run: cargo update -p cc --precise 1.0.94 && cargo update -p jobserver --precise 0.1.28
       - name: Build
         run: conda run --no-capture-output ci/scripts/integration_arrow_build.sh $PWD /build
       - name: Run