Fix workspace protocol to use caret to avoid unnecessary duplication

[SergeAstapov]

@mansona I guess this is the reason why fastboot-express-middleware was not included in latest release https://github.com/ember-fastboot/ember-cli-fastboot/releases/tag/v4.1.5-ember-cli-fastboot

Closes #951

[mansona]

so to be honest I think there was too much stuff included in the last release 🤔 I didn't expect anything other than fastboot-app-server to be released since it's downstream from fastboot and ember-cli-fastboot

i didn't investigate since it was such a small issue I didn't think it mattered

[SergeAstapov]

@mansona as far as I see, it publishes everything because release-plan pin dependencies to specific version (or maybe it's pnpm) when the package or it's dependencies within monorepo gets bumped/published.

because of the typo fixed in this PR, fastboot-express-middleware was not bumped and published in previous releases. As a result, latest https://www.npmjs.com/package/ember-cli-fastboot?activeTab=code points to "fastboot": "4.1.5" and "fastboot-express-middleware": "4.1.2"

whereas https://www.npmjs.com/package/fastboot-express-middleware?activeTab=code points to "fastboot": "4.1.2" so we end up using mix of fastboot libraries.

@mansona pushed fix for pnpm-lock.yaml file to make CI happy.

[SergeAstapov]

@mansona this was updated according to discussion in #951