Fixed minor style errors

fixing an issue where github runners fill up on /tmp (ava-labs#1081)

README: Clarify minimum macOS version

bumped coreth version

Remove "vms/components/core" Package (ava-labs#1011)

bumped coreth version

added clarification comment

Add height to bootstrapping block job execution log

Merge pull request ava-labs#955 from ava-labs/c-chain-release-notes

Merge branch 'dev' into grpc-update