Update to backends/tc/CMakeLists.txt updated version release-v17-rc8 and sha256 hash

[trvon]

Updating release version and sha256 of iproute2repo to fix dead URL issue in build. issue

[jafingerhut]

@trvon Thanks for the PR. If you could take a look at this alternate PR to verify whether it includes all of your changes (and more), that would be appreciated: #5172

[trvon]

I will verify my approach against the current test cases, but it looks like the other pull request takes a different approach by moving the iproute2repo and p4cbpfrepo fetch and build from the backends/tc/CMakeList.txt to tools/ci-build.sh.

[jafingerhut]

I will verify my approach against the current test cases, but it looks like the other pull request takes a different approach by moving the iproute2repo and p4cbpfrepo fetch and build from the backends/tc/CMakeList.txt to tools/ci-build.sh.

My guess/belief is that without that other PR's changes, or something like them, iproute2 is built for all of the current CI tests, which is unnecessary given that it is only used for tests on the p4tc backend.

[trvon]

I see that the merge of the other branch went through, I can close this request if needed. I was also able to fix the test errors with another hash update to the requirements.txt.