[image_picker]: Bump gradle from 3.3.0 to 7.2.1 in /packages/image_picker/image_picker_android/android

[dependabot[bot]]

Bumps gradle from 3.3.0 to 7.2.1.

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[cyanglaz]

@dependabot rebase

[stuartmorgan]

Looks like this breaks something. @GaryQian can you investigate to see what else needs updating with this?

[dependabot[bot]]

A newer version of com.android.tools.build:gradle exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.

[stuartmorgan]

/cc @bparrishMines