BLD: use ninja instead of make (#208)

* BLD: use `ninja` instead of `make`

* BLD: rely on `ninja` for build parallelism

Author: lucascolley

.github/workflows/tests.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - uses: prefix-dev/setup-pixi@92815284c57faa15cd896c4d5cfb2d59f32dc43d # v0.8.3
         with:
-          pixi-version: v0.70.1
+          pixi-version: v0.73.0
           cache: true
           cache-key: ${{ matrix.runs-on }}
           environments: ci
@@ -55,7 +55,7 @@ jobs:
           fi
         shell: bash
       - name: Build xsf
-        run: pixi run --environment=ci build-tests-cov $NUM_WORKERS
+        run: pixi run --environment=ci build-tests-cov
       - name: Run tests
         run: pixi run --environment=ci --skip-deps tests-only $NUM_WORKERS
       - name: Generate coverage report
@@ -112,7 +112,7 @@ jobs:
           fi
         shell: bash
       - name: Build xsf
-        run: pixi run --environment=ci build-tests-debug $NUM_WORKERS
+        run: pixi run --environment=ci build-tests-debug
       - name: Run tests
         run: pixi run --environment=ci --skip-deps tests-debug $NUM_WORKERS
       - name: Ccache performance