Switch to Apache 2.0 or MIT #23

Job	Run time
linux-native (gnu)	15s
darwin (macos-13)	49s
linux-native (musl)	13s
linux-cross (aarch64-linux-android)	49s
darwin (macos-15)	25s
lint (panic)	12s
linux-cross (arm-linux-androideabi)	50s
lint (itanium)	14s
miri-linux (x86_64-unknown-linux-gnu)	1s
linux-cross (armv7-linux-androideabi)	49s
lint (seh)	14s
test-stable	1s
miri-linux (i686-unknown-linux-gnu)	1s
linux-cross (arm-unknown-linux-gnueabi)	50s
miri-linux (powerpc64-unknown-linux-gnu)	1s
linux-cross (arm-unknown-linux-gnueabihf)	49s
valgrind	1s
linux-cross (arm-unknown-linux-musleabi)	50s
windows (x86_64, msvc)	1s
linux-cross (arm-unknown-linux-musleabihf)	50s
windows (x86_64, gnu)	1s
linux-cross (armv7-unknown-linux-gnueabihf)	50s
windows (i686, msvc)	14s
linux-cross (i686-unknown-linux-gnu)	48s
windows (i686, gnu)	16s
linux-cross (i686-unknown-linux-musl)	47s
linux-cross (loongarch64-unknown-linux-gnu)	47s
linux-cross (loongarch64-unknown-linux-musl)	49s
linux-cross (mips64-unknown-linux-gnuabi64)	48s
linux-cross (mips64el-unknown-linux-gnuabi64)	49s
linux-cross (powerpc64-unknown-linux-gnu)	29s
linux-cross (powerpc64le-unknown-linux-gnu)	48s
linux-cross (riscv64gc-unknown-linux-gnu)	1s
linux-cross (s390x-unknown-linux-gnu)	10s
linux-cross (sparc64-unknown-linux-gnu)	1s
	15m 53s

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