Remove std dependency from rand in mc-sgx-core-types

Also omit `mc-sgx-core-types` from cargo nono checks since cargo nono
does not resolve this correctly.
hobofan/cargo-nono#64 has a suggestion to help
alleviate these occurrences, but it's been dormant for a year.

Author: nick-mobilecoin

.github/workflows/lint.yaml

@@ -34,10 +34,13 @@ jobs:
       - name: install nono
         run: cargo install cargo-nono
       # `mc-sgx-quote-verify` should be `no_std`, but it isn't yet.  See #34
+      # `mc-sgx-core-types` should be `no_std`, but cargo nono doesn't parse
+      # correctly, see https://github.com/hobofan/cargo-nono/pull/64 for a
+      # suggested improvement
       - run: |
           cargo metadata --no-deps --format-version=1 | \
             jq -r '.packages[].name' | \
-            grep -v -e mc-sgx-core-build -e mc-sgx-dcap-quoteverify-sys -e mc-sgx-dcap-ql-sys -e mc-sgx-quote-verify -e mc-sgx-urts -e mc-sgx-capable-sys | \
+            grep -v -e mc-sgx-core-types -e mc-sgx-core-build -e mc-sgx-dcap-quoteverify-sys -e mc-sgx-dcap-ql-sys -e mc-sgx-quote-verify -e mc-sgx-urts -e mc-sgx-capable-sys | \
             xargs -n1 sh -c 'cargo nono check --package $0 || exit 255'
   markdown-lint:
     runs-on: ubuntu-20.04

core/types/Cargo.toml

@@ -5,11 +5,15 @@ edition = "2021"
 
 [dependencies]
 mc-sgx-core-sys-types = { path = "../sys/types", version = "=0.1.0" }
-rand = "0.8.5"
+rand = { version = "0.8.5", default-features = false }
 serde = { version = "1.0.143", default-features = false, features = ["derive"], optional = true }
 
 [features]
 serde = ["dep:serde"]
 
 [dev-dependencies]
 yare = "1.0.1"
+
+[dev-dependencies.rand]
+version = "0.8.5"
+features = ["std"]