wpcomsh: Update wc-calypso-bridge to 2.8.0

[mreishus]

Proposed changes:

This PR bumps the version of wc-calypso-bridge to 2.8.0, which includes the following change:

• Move "composer/installers" package to require-dev. wc-calypso-bridge#1513

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

Does this pull request change what data or activity we track or use?

No

Testing instructions:

The changes related to the wc-calypso-bridge were already tested in the linked PRs. Testing instructions can be found on the linked PRs above.

[github-actions]

Thank you for your PR!

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