Actively return pool connections #526

Job	Run time
Run checks (ubuntu-latest)	3m 22s
Run checks (macos-latest)	2m 14s
Run checks (windows-latest)	3m 14s
Build library (iOS) (aarch64-apple-ios)	7m 54s
Build library (Android) (aarch64-linux-android)	10m 4s
Build library (iOS) (aarch64-apple-ios-sim)	9m 12s
Run tests (ubuntu-latest)	6m 42s
Build library (Android) (armv7-linux-androideabi)	8m 12s
Build library (linux-aarch64, ubuntu-latest, libaries_askar.so, aarch64-unknown-linux-gnu, true)	6m 15s
Run tests (macos-latest)	8m 26s
Build library (Android) (i686-linux-android)	8m 25s
Build library (linux-x86_64, ubuntu-latest, libaries_askar.so, x86_64-unknown-linux-gnu, true)	6m 21s
Build library (iOS) (x86_64-apple-ios)	7m 36s
Run tests (windows-latest)	8m 0s
Build library (Android) (x86_64-linux-android)	8m 20s
Build library (darwin-universal, macos-latest, libaries_askar.dylib, darwin-universal, beta)	9m 2s
Build library (windows-x86_64, windows-latest, aries_askar.dll, x86_64-pc-windows-msvc)	5m 50s
Create iOS xcframework	1m 8s
Create library (Android)	17s
Create iOS and Android release assets	0s
Build and test JavaScript wrapper	1m 42s
Build and test Python wrapper (linux-aarch64, 3.8)	21s
Build and test Python wrapper (linux-x86_64, 3.8)	26s
Build and test Python wrapper (darwin-universal, 3.8)	27s
Build and test Python wrapper (windows-x86_64, 3.8)	47s
	2h 4m 17s

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