CI: install pyusb before the tests

tests/test_capture.py builds a DirectSniffer, whose lazy import reaches
simtrace2_pysniff.device -> usb.core; the runner has no PyUSB, so two tests
failed there while passing on a workstation that already had it.  The job now
installs the declared runtime dependency next to build.

.github/workflows/release.yml

@@ -36,8 +36,8 @@ jobs:
           fi
           grep -q "PWA_VERSION = '$version'" frontend/index.html
 
-      - name: Install build tooling
+      - name: Install build tooling and the runtime dependency
-        run: python -m pip install --upgrade pip build
+        run: python -m pip install --upgrade pip pyusb build
 
       - name: Python tests
         run: python -m unittest discover -s tests