Fix CI, Bump MSRV to 1.70.0 (#128) #333

Job	Run time
rust_clippy_check_ubuntu	4m 53s
rust_clippy_check_windows	26m 44s
docs_rs_check	55s
build_static_and_test_ubuntu (release/4.3, nightly, no valgrind)	7m 4s
build_static_and_test_ubuntu (release/4.3, 1.70.0, no valgrind)	6m 35s
rustfmt_check (macos-latest)	23s
build_static_and_test_ubuntu (release/5.0, nightly, no valgrind)	7m 16s
rustfmt_check (windows-latest)	46s
build_static_and_test_ubuntu (release/5.0, 1.70.0, no valgrind)	6m 44s
rustfmt_check (ubuntu-latest)	14s
build_dynamic_and_test_windows_pre	7m 1s
build_static_and_test_ubuntu (release/6.0, nightly, valgrind)	1h 4m 52s
build_static_and_test_ubuntu (release/6.0, nightly, no valgrind)	7m 13s
build_static_and_test_ubuntu (release/6.0, 1.70.0, no valgrind)	6m 48s
build_dynamic_and_test_windows (nightly)	2m 25s
build_dynamic_and_test_windows (1.70.0)	2m 12s
	2h 32m 5s

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