chore: update prost (prost-types & prost-build) from 0.11.0 to 0.12.0 #606

Job	Run time
Clippy	2m 1s
Clippy	2m 1s
Check	2m 27s
Check	2m 27s
Check rustdoc intra-doc links	51s
Check rustdoc intra-doc links	51s
Cross compile (armv7-unknown-linux-gnueabihf)	30s
Cross compile (armv7-unknown-linux-gnueabihf)	26s
Cross compile (mipsel-unknown-linux-gnu)	24s
Cross compile (mipsel-unknown-linux-gnu)	18s
Cross compile (powerpc-unknown-linux-gnu)	31s
Cross compile (powerpc-unknown-linux-gnu)	25s
Cross compile (powerpc64-unknown-linux-gnu)	30s
Cross compile (powerpc64-unknown-linux-gnu)	24s
Cross compile (wasm32-unknown-unknown)	30s
Cross compile (wasm32-unknown-unknown)	25s
Rustfmt	30s
Rustfmt	30s
Test Suite	2m 42s
Test Suite	2m 42s
	21m 25s

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