chore(deps): update rstest requirement from 0.18 to 0.21 #729

Job	Run time
Run checks (macos-12)	1m 31s
Run checks (windows-latest)	2m 14s
Run checks (ubuntu-latest)	54s
Run Test Suite	5m 31s
Build library (linux-aarch64, ubuntu-latest, libindy_vdr.so, aarch64-unknown-linux-gnu, true)	3m 4s
Build library (linux-x86_64, ubuntu-latest, libindy_vdr.so, x86_64-unknown-linux-gnu, true)	3m 0s
Build library (darwin-universal, macos-12, libindy_vdr.dylib, darwin-universal, beta)	4m 23s
Build library (iOS) (aarch64-apple-ios)	3m 8s
Build library (Android) (aarch64-linux-android)	3m 40s
Build library (windows-x86_64, windows-latest, indy_vdr.dll, x86_64-pc-windows-msvc)	4m 53s
Build library (iOS) (aarch64-apple-ios-sim)	3m 24s
Build library (iOS) (x86_64-apple-ios)	3m 14s
Build library (Android) (armv7-linux-androideabi)	3m 39s
Build library (Android) (i686-linux-android)	3m 50s
Build library (Android) (x86_64-linux-android)	3m 47s
Create library (Android)	6s
Create iOS xcframework	35s
Build and Test Go wrapper	16s
Build and Test JavaScript wrapper	1m 29s
Build and test Python wrapper (linux-aarch64, 3.8)	18s
Build and test Python wrapper (linux-x86_64, 3.8)	20s
Build and test Python wrapper (darwin-universal, 3.8)	32s
Build and test Python wrapper (windows-x86_64, 3.8)	1m 3s
Create iOS and Android release assets	0s
	54m 51s

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