fix: Arabic translation of Sign In With Apple button label

Description

Currently the label of the Sign In With Apple button in Arabic looks like the left image on a Pixel 6 Pro phone. Apple rejects apps that look like this because it does not adhere to its design guidelines. The label overlaps with Apple logo and the phrase is different than Apple's translation. This PR is a simple fix to issue and the result can be seen below.

Before	After

Apple Design Guidelines

Related Issues

None.

Checklist

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[x] I read the Contributor Guide and followed the process outlined there for submitting PRs.
[x] My PR includes unit or integration tests for all changed/updated/fixed behaviors (See Contributor Guide).
[x] All existing and new tests are passing.
[x] I updated/added relevant documentation (doc comments with ///).
[x] The analyzer (melos run analyze) does not report any problems on my PR.
[x] All unit tests pass (melos run test:unit:all doesn't fail).
[x] I read and followed the Flutter Style Guide.
[x] I signed the CLA.
[x] I am willing to follow-up on review comments in a timely manner.

Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

[ ] Yes, this is a breaking change.
[x] No, this is not a breaking change.

firebase / FirebaseUI-Flutter