fix example app baseflow git url

[Ritsz123]

Signed-off-by: Ritesh Khadse [email protected]

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

fix for #367
fix git url in example app of flutter_cache_manager

⤵️ What is the current behavior?

currently on running the command flutter pub get I was getting

fatal: remote error: The unauthenticated git protocol on port 9418 is no longer supported. Please see https://github.blog/2021-09-01-improving-git-protocol-security-github/ for more information. exit code: 128

reference of fix:
https://stackoverflow.com/questions/70663523/the-unauthenticated-git-protocol-on-port-9418-is-no-longer-supported

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

💥 Does this PR introduce a breaking change?

🐛 Recommendations for testing

📝 Links to relevant issues/docs

🤔 Checklist before submitting

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