fix(firebase_core): broken homepage link in pubspec.yaml

[OutdatedGuy]

Description

Adds / in homepage url in pubspec.yaml to get response status 200

Screenshots

Without /

With /

Related Issues

Fixes #9313

Checklist

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This will ensure a smooth and quick review process. Updating the pubspec.yaml and changelogs is not required.

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• My PR includes unit or integration tests for all changed/updated/fixed behaviors (See Contributor Guide).
• All existing and new tests are passing.
• I updated/added relevant documentation (doc comments with ///).
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Breaking Change

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• Yes, this is a breaking change.
• No, this is not a breaking change.

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[Ehesp]

The original link works fine for me?

[russellwheatley]

@Ehespit it works, but it is a redirect and it affects the score on pub.dev as described in the description.