Remove upper constraints

[mit-mit]

Description

Align plugins with new templates, removing unused upper constraint

Related Issues

flutter/flutter#68437

[mit-mit]

cc @amirh

[ditman]

This LGTM in general, wouldn't we need to bump the patch version of each plugin + their CHANGELOG so they become publishable in pub.dev?

[amirh]

Can you add CHANGELOG entries and bump the versions?

[google-cla]

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[google-cla]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[mit-mit]

@googlebot I fixed it

[google-cla]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[mit-mit]

Abandoning for #3236