Pin and bump `bls12_381_plus` dependency (#1378) #8

Job	Run time
check-for-run-condition	1s
check-for-modification	4s
build-wasm / build-wasm (ubuntu-latest)	3m 42s
build-and-test (ubuntu-latest)	4m 7s
build-and-test (macos-latest)	8m 18s
build-and-test (windows-latest)	32m 38s
test-wasm	0s
	48m 50s

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