Update nixpkgs

[nomeata]

to include the patch we tried in #2542

[nomeata]

I can no longer see the hydra logs, so you’ll have to debug this on your own (until we have #2565, which I can’t quite tell how fast it’ll be)

[ggreif]

Every failure (there are many) like moc or wasmtime ends with

[100%] Running all regression tests
/nix/store/ibzil11xfiz695dbalq2swj4wf42g7ad-python3-3.8.9/bin/python3.8 /build/llvm/build/./bin/llvm-lit -sv /build/llvm/build/utils/lit /build/llvm/build/test
llvm-lit: /build/llvm/build/utils/lit/tests/lit.cfg:79: warning: Setting a timeout per test not supported. Requires the Python psutil module but it could not be found. Try installing it via pip or via your operating system's package manager. Some tests will be skipped and the --timeout command line argument will not work.
building of '/nix/store/1xhwg99kj7rlyvdlhd38w6r6s5h3d3q7-llvm-12.0.0-lib', '/nix/store/c7bcadszgifq1cszl907ljga7k9lzm5i-llvm-12.0.0-python', '/nix/store/pxz11awg60s91qs1c7h4z3d52s2ffdq4-llvm-12.0.0-dev', '/nix/store/w60gc66ksddgav0x92z8fwki2rms2fx1-llvm-12.0.0' timed out after 900 seconds of silence

[dfinity-ci]

In terms of gas, no changes are observed in 3 tests.
In terms of size, 3 tests improved and the mean change is -0.0%.

[nomeata]

Looks good. Can be merged once hydra has caught up, or after removing hydra :-)

[github-actions]

Comparing from 62582b6 to a6bc535:
In terms of gas, no changes are observed in 3 tests.
In terms of size, 3 tests improved and the mean change is -0.0%.

[nomeata]

Looks like hydra doesn't like this. Anybody know why? Or we just ignore it, and merge this after #2748