Restore CI for `riscv64gc-unknown-linux-gnu` #861

Job	Run time
apidiff (aws-lc-sys, branch)	2m 52s
bindgen-dependency (ubuntu-latest)	24s
apidiff (aws-lc-sys, published)	2m 49s
bindgen-fips-dependency (ubuntu-latest)	23s
bindgen-dependency (macos-12)	42s
apidiff (aws-lc-fips-sys, branch)	2m 52s
bindgen-fips-dependency (macos-12)	50s
bindgen-dependency (macos-13-xlarge)	31s
apidiff (aws-lc-fips-sys, published)	3m 8s
bindgen-fips-dependency (macos-13-xlarge)	28s
bindgen-dependency (windows-latest)	1m 2s
bindgen-fips-dependency (windows-latest)	1m 1s
apidiff (aws-lc-rs, branch)	2m 49s
apidiff (aws-lc-rs, published)	2m 53s
clippy (aws-lc-rs, --features bindgen,unstable)	1m 18s
copyright	4s
clippy (aws-lc-rs, --features bindgen,unstable,fips)	1m 36s
dependency-review	20s
clippy (aws-lc-rs, --no-default-features --features aws-lc-sys)	56s
Resolve the dependencies to the minimum SemVer version	51s
mirai-analysis	2m 20s
rustfmt	30s
metadata-checks	33s
semver-checks	1m 9s
udeps	7m 23s
	39m 44s

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