chore: Update dependencies for Firebase Cache Manager

[percula]

:sparkles: What kind of change does this PR introduce? (Bug fix, feature, docs update...)

Updates the Firebase Storage dependency. Also increases Dart SDK to include the newly-release 3.0.0.

I also updated the changelog and bumped the release number so this change is ready to release as v2.0.2.

:arrow_heading_down: What is the current behavior?

Not updated

:new: What is the new behavior (if this is a feature change)?

Updated!

:boom: Does this PR introduce a breaking change?

No

:bug: Recommendations for testing

See if it compiles 😉

:memo: Links to relevant issues/docs

Fixes #392

:thinking: Checklist before submitting

• [x] All projects build
• [x] Follows style guide lines (code style guide)
• [x] Relevant documentation was updated
• [x] Rebased onto current develop

[cbenhagen]

@renefloor is there anything blocking this PR?