[image_picker] bump androidx.activity:activity to 1.7.0

[tarrinneal]

bumps androidx.activity:activity to 1.7.0

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[tarrinneal]

@gmackall any chance you can help me with the failing tests? I'm not entirely sure what the conflict is. I'm sure it's simple enough though.

[gmackall]

Oh interesting, this seems to be the same failure as the one on this dependabot pr https://github.com/flutter/packages/pull/3381. I put an initial guess as to the cause in the comments, but I'm actually not sure yet.

[gmackall]

I've made an issue to track this failure https://github.com/flutter/flutter/issues/125062 and have a pr to fix it in one of the existing dependabot upgrades. I'm waiting for that to be approved/merged to confirm it works as expected, and then I will take over this one as well.

[reidbaker]

Note from triage @gmackall is taking this over.

[gmackall]

Closing this as its a version with a solution to the duplicate class failures is here: https://github.com/flutter/packages/pull/3968