fix: update MSRV to 1.78 to solve tv_nsec related panics #2477

Job	Run time
security_audit	16s
check_if_pr	1s
no-merge-commits	6s
Conventional Commits	5s
unit-tests-freebsd	6m 14s
Check Nix Flake (build, x86_64-linux)	2m 14s
Check Nix Flake (formatting, x86_64-linux)	1m 14s
unit-tests (ubuntu-latest, 1.70.0)	2m 27s
Build Nix package (x86_64-linux)	5m 5s
Check Nix Flake (lint, x86_64-linux)	2m 17s
unit-tests-netbsd	7m 51s
unit-tests (ubuntu-latest, stable)	2m 31s
unit-tests (ubuntu-latest, beta)	2m 21s
Check Nix Flake (pre-commit-check, x86_64-linux)	1m 12s
unit-tests-openbsd	7m 51s
unit-tests (ubuntu-latest, nightly)	2m 32s
unit-tests (macos-latest, 1.70.0)	2m 37s
Check Nix Flake (test, x86_64-linux)	4m 11s
unit-tests (macos-latest, stable)	2m 23s
Check Nix Flake (trycmd, x86_64-linux)	2m 27s
unit-tests (macos-latest, beta)	2m 23s
unit-tests (macos-latest, nightly)	2m 36s
unit-tests (windows-latest, 1.70.0)	3m 41s
unit-tests (windows-latest, stable)	3m 43s
unit-tests (windows-latest, beta)	3m 47s
unit-tests (windows-latest, nightly)	3m 35s
	1h 15m 40s

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