* fix: update hardhat to use correct solc url

https://github.com/nomiclabs/hardhat/issues/1332\#issuecomment-818212424

* fix(core-utils): revert sentry/node version to 6.2.5

so that it's compatible with pino-sentry 0.7.0 https://github.com/aandrewww/pino-sentry/pull/25

This was required because the hardhat upgrade removed any older versions
of the dependency which were still around and could be used.

* chore: add changeset

* ci: allow tests to be run on demand