Cleanup EVP_PKEY serialization #1312

Job	Run time
apidiff (aws-lc-sys, branch)	2m 53s
bindgen-dependency (ubuntu-latest)	16s
apidiff (aws-lc-sys, published)	3m 2s
bindgen-dependency (macos-13)	39s
apidiff (aws-lc-fips-sys, branch)	3m 10s
bindgen-dependency (macos-14-xlarge)	28s
apidiff (aws-lc-fips-sys, published)	3m 50s
bindgen-dependency (windows-latest)	59s
apidiff (aws-lc-rs, branch)	2m 51s
apidiff (aws-lc-rs, published)	3m 22s
bindgen-fips-dependency (ubuntu-latest)	17s
clippy (aws-lc-rs, --features bindgen,unstable)	1m 13s
bindgen-fips-dependency (macos-13)	40s
clippy (aws-lc-rs, --features bindgen,unstable,fips)	1m 41s
bindgen-fips-dependency (macos-14-xlarge)	34s
dependency-review	18s
clippy (aws-lc-rs, --no-default-features --features aws-lc-sys)	56s
bindgen-fips-dependency (windows-latest)	1m 5s
metadata-checks	30s
Resolve the dependencies to the minimum SemVer version (aws-lc-rs)	41s
rustfmt	24s
Resolve the dependencies to the minimum SemVer version (aws-lc-sys)	39s
semver-checks	1m 23s
Resolve the dependencies to the minimum SemVer version (aws-lc-fips-sys)	1m 0s
udeps	7m 49s
	40m 40s

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