Upgrade Nix flake and deps #814

Job	Run time
build (Release)	1m 46s
analyzers	1m 6s
check-accurate-generations	1m 49s
build-nix	3m 10s
build (Debug)	1m 42s
check-dotnet-format	38s
check-nix-format	31s
Check flake	21s
Check links	40s
nuget-pack	1m 42s
expected-pack	6s
github-release-dry-run (nuget-package-plugin)	8s
github-release-dry-run (nuget-package-attribute)	4s
all-required-checks-complete	3s
attestation-attribute	0s
github-release	0s
nuget-publish-attribute	0s
attestation-plugin	0s
nuget-publish-plugin	0s
	13m 46s

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