[package] do not test wheels for i686 or win32

The cryptography stopped publishing wheels for 32-bit platforms, making it
impractical to run the test suite for these platforms.

.github/workflows/tests.yml

@@ -92,8 +92,10 @@ jobs:
           CIBW_BEFORE_BUILD_WINDOWS: python scripts\fetch-vendor C:\cibw\vendor
           CIBW_ENVIRONMENT: AIOQUIC_SKIP_TESTS=ipv6,loss CFLAGS=-I/tmp/vendor/include LDFLAGS=-L/tmp/vendor/lib
           CIBW_ENVIRONMENT_WINDOWS: AIOQUIC_SKIP_TESTS=ipv6,loss INCLUDE=C:\\cibw\\vendor\\include LIB=C:\\cibw\\vendor\\lib
-          CIBW_SKIP: cp27-* cp33-* cp34-* cp35-* pp27-*
+          CIBW_SKIP: cp27-* cp35-* pp27-*
           CIBW_TEST_COMMAND: python -m unittest discover -t {project} -s {project}/tests
+          # there are no wheels for cryptography on these platforms
+          CIBW_TEST_SKIP: "*-{manylinux_i686,win32} pp*"
         run: |
           pip install cibuildwheel
           cibuildwheel --output-dir dist