[ci] Pin the simulator toolchain build - #11
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CI installed Icarus Verilog from apt, which ships an older release than the OSS CAD Suite build this repository is developed against, so a construct that compiles on a laptop could still fail on the runner. The testbench and formal jobs now take their simulators from one dated OSS CAD Suite build named once at the top of the workflow. The cocotb loopback moves to its own job that keeps apt and pip, because the suite bundles a development build of cocotb whose teardown segfaults after the test itself passes, which reproduces locally under the same build. The same RTL is still dialect-checked against the pinned suite by the testbench job.