chore: Bump msrv to 1.70 #2309

Job	Run time
cargo-deny check	22s
rustfmt	9s
codegen	20s
Check unused dependencies (ubuntu-latest)	3m 55s
check (ubuntu-latest)	1m 9s
Check unused dependencies (macOS-latest)	10m 59s
check (macOS-latest)	2m 19s
Check unused dependencies (windows-latest)	7m 46s
Interop Tests (ubuntu-latest)	36s
check (windows-latest)	4m 18s
Interop Tests (macOS-latest)	1m 28s
Interop Tests (windows-latest)	5m 45s
Check MSRV	1m 49s
test (ubuntu-latest)	3m 15s
test (macOS-latest)	5m 57s
test (windows-latest)	4m 40s
	54m 47s

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