Drop CI job for Ubuntu 16.04 (xenial)

It starts causing troubles, and, given that Ubuntu 16.04 is three years over its End of Standard Support, I don't feel like we should care much about it.
haskell · Jun 1, 2024 · 552add2 · 552add2
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commit 552add2
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diff --git a/.github/workflows/haskell-ci-xenial.yaml b/.github/workflows/haskell-ci-xenial.yaml