Upgrade to v116. #389

Job	Run time
Cargo fmt	9s
Conformance Tests	29m 2s
Without dwarf feature	36m 33s
build (macos-11, stable)	7m 41s
build (macos-11, 1.48.0)	19m 3s
build (windows-2019, stable)	8m 2s
build (windows-2019, 1.48.0)	13m 20s
build (ubuntu-20.04, stable)	10m 26s
build (ubuntu-20.04, 1.48.0)	17m 12s
build (ubuntu-20.04, nightly)	8m 27s
build (ubuntu-20.04, beta)	10m 27s
build (ubuntu-20.04, i686-unknown-linux-gnu, stable)	12m 12s
build (windows-2019, i686-pc-windows-msvc, stable)	9m 0s
build (ubuntu-20.04, clang, clang++, stable)	8m 1s
build (ubuntu-20.04, gcc-7, g++-7, stable)	10m 8s
build (ubuntu-20.04, clang-7, clang++-7, stable)	8m 27s
	3h 28m 10s

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