boring-sys: Bump BoringSSL to e2a57cfb4 #1687

Job	Run time
Test FIPS integration	4m 26s
Test BoringSSL upstream test suite	3m 37s
Cross build from macOS to Linux (x86_64-unknown-linux-gnu)	1m 41s
Test features	7m 9s
clippy	2m 12s
Test (i686-android)	3m 10s
rustfmt	4s
Test (i686-mingw)	4m 22s
Test (arm-android)	3m 6s
Test (arm64-android)	3m 0s
Test (stable)	2m 46s
Test (aarch64-ios-sim)	2m 12s
Test (x86_64-macos)	2m 41s
Test (arm-linux)	4m 0s
Test (aarch64-ios)	2m 17s
Test (x86_64-android)	3m 4s
Test (i686-linux)	3m 3s
Test (aarch64-linux)	3m 35s
Test (arm64-macos)	2m 13s
Test (x86_64-msvc)	5m 12s
Test (x86_64-msvc-static, x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest, 1, -Dwarnin...	8m 30s
Test (x86_64-ios)	2m 6s
Test (x86_64-mingw)	1m 12s
Test (i686-msvc)	5m 4s
	1h 20m 42s

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