Update Rust version used in CI #755

Job	Run time
Lint	2m 48s
Build Android Libraries (aarch64-linux-android)	1m 56s
Build ios Libraries (aarch64-apple-ios)	5m 17s
Build Android Libraries (armv7-linux-androideabi)	2m 0s
Build Library (linux-aarch64, anoncreds-ubuntu-latest, aarch64-unknown-linux-gnu, libanoncreds.so...	4m 7s
Build Android Libraries (i686-linux-android)	2m 41s
Build ios Libraries (aarch64-apple-ios-sim)	5m 14s
Test (anoncreds-windows-latest)	13m 54s
Build Android Libraries (x86_64-linux-android)	1m 44s
Build Library (linux-x86_64, anoncreds-ubuntu-latest, x86_64-unknown-linux-gnu, libanoncreds.so, ...	4m 2s
Test (anoncreds-ubuntu-latest)	7m 15s
Build ios Libraries (x86_64-apple-ios)	3m 46s
Build Library (darwin-x86_64, macos-latest, x86_64-apple-darwin, libanoncreds.dylib)	9m 11s
Build Library (darwin-aarch64, macos-latest, aarch64-apple-darwin, libanoncreds.dylib)	6m 3s
Build Library (darwin-universal, macos-latest, darwin-universal, libanoncreds.dylib)	8m 37s
Build Library (windows-x86_64, anoncreds-windows-latest, windows-x86_64, x86_64-pc-windows-msvc, ...	7m 35s
Create android libraries	0s
Create ios xcframework	0s
Create iOS and Android Release Assets	0s
Build and Test JavaScript wrapper	2m 25s
Build Python (anoncreds-ubuntu-latest, linux-aarch64, manylinux2014_aarch64)	20s
Build Python (anoncreds-ubuntu-latest, linux-x86_64, manylinux2014_x86_64)	28s
Build Python (macos-latest, darwin-universal, macosx_10_9_universal2)	30s
Build Python (anoncreds-windows-latest, windows-x86_64, win_amd64)	26s
	1h 30m 19s

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