fix(crypto): mac_context_dtor should free MAC #18309

Job	Run time
Event File	2s
Build Erlang/OTP (64-bit)	7m 42s
Build Erlang/OTP (iOS)	4m 5s
Build Erlang/OTP (macOS)	3m 50s
Build Erlang/OTP (Types and Flavors)	8m 0s
Build Erlang/OTP (32-bit)	9m 32s
Build Erlang/OTP (Windows)	12m 4s
Build Erlang/OTP (cross-compile)	14m 14s
Build and check documentation	4m 55s
Run static analysis	6m 8s
Build Erlang/OTP (clang)	5m 46s
Test Erlang/OTP (crypto)	4m 50s
Test Erlang/OTP (system)	7m 21s
Release Erlang/OTP	0s
	1h 28m 29s

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