chore: bump app_links to '>=6.2.0 <8.0.0'

[spydon]

What kind of change does this PR introduce?

This updates app_links to ^7.0.0 so that users with this as a direct dependency aren't stuck on an old version.

What is the current behavior?

Users can't use the newest app_links version.

What is the new behavior?

Users can use the newest app_links version.

[Vinzent03]

This is a breaking change and requires the latest flutter version which is not desired. Since the v7 is compatible with v6 we should just allow both versions to be used instead of forcing v7.

[spydon]

This is a breaking change and requires the latest flutter version which is not desired. Since the v7 is compatible with v6 we should just allow both versions to be used instead of forcing v7.

Fair enough, updated it to include both versions

[coveralls]

Pull Request Test Coverage Report for Build 20132774381

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 79.876%

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Totals
Change from base Build 19432856166:	0.03%
Covered Lines:	3350
Relevant Lines:	4194

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💛 - Coveralls

[Vinzent03]

Thanks for the change!