Dockerfile: install tcc-libs-static

Despite no change to the Dockerfile on our end, we were seeing an error:

tcc: error: libtcc1.a not found

This was due to Alpine splitting the tcc package into:

combined with the other underlying problems:

The tcc package in Alpine is in the testing repo, which makes breaking changes more likely
The CI workflow was skipped in a PR that changed only docs, but would have failed if it ran
The deployment workflow runs on main even if the CI workflow fails on main
The tcc package isn't pinned, because we can't reliably pin package versions on Alpine:

Install the new tcc-libs-static subpackage so that libtcc1.a is available again. See the contents of the tcc packages:

This commit also bumps the tcc version, because the current state (bcb20108c76d) was deployed after the upstream bump.

exercism / nim-test-runner