Remove MIPS from CI #1

Job	Run time
Rustfmt	4s
Test (ubuntu-latest, stable)	13s
Test (ubuntu-latest, beta)	21s
Test (ubuntu-latest, nightly)	30s
Test (macos-latest, stable)	19s
Test (macos-latest, beta)	24s
Test (macos-latest, nightly)	23s
Test (windows-latest, stable)	1m 3s
Test (windows-latest, beta)	1m 0s
Test (windows-latest, nightly)	1m 0s
Test Cross Compile - aarch64-apple-ios	19s
Test Cross Compile - aarch64-unknown-linux-gnu	32s
Test Cross Compile - arm-unknown-linux-gnueabihf	29s
Test Cross Compile - powerpc-unknown-linux-gnu	31s
Test Cross Compile - s390x-unknown-linux-gnu	36s
Test Cross Compile - x86_64-unknown-linux-musl	40s
Test Cross Compile - aarch64-unknown-linux-musl	41s
Test Cross Compile - x86_64-pc-windows-gnu	50s
Test Cross Compile - x86_64-unknown-freebsd	29s
Test Cross Compile - x86_64-unknown-netbsd	39s
Test Cross Compile - x86_64-sun-solaris	7s
Test Cross Compile - x86_64-unknown-illumos	42s
	11m 52s

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