Changes

jobs/ttcn3-testsuites-testenv: Add ttcn3-pcap-client-test-io_uring

Since osmo-pcap.git Change-Id I72e8a6ceb4fb1eb70372e13bb139ead0e2bc0860,
osmo-pcap-client uses osmo_stream which in turn uses osmo_io (which can
u io_uring backend).
Hence, add io-uring backend to the test matrix for this project.

Change-Id: I817b4d27cd2e8faabf2ebb5ad28f025535571282