[Tool] Configure Dependabot to Ignore AGP Plugins

[ParaskP7]

This PR disables Dependabot alerts for AGP plugins. As cited from the code comments, the Android Gradle Plugin is a dependency that needs to be in sync with other in-house libraries due to compatibility with composite build.

PS: This configuration update was already done on WCAndroid, and as such, this commit just replicates the same configuration. @wzieba I added you as the reviewer here as it would be super-quick for you to verify that change on WPAndroid too, many thanks in advance. 😊

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To test:

See testing instructions on WCAndroid PR here. Verifying that this indeed worked on WCAndroid (its fork) should be enough, no need for extra testing instructions on WPAndroid.

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Regression Notes

1. Potential unintended areas of impact

   • N/A

2. What I did to test those areas of impact (or what existing automated tests I relied on)

   • See To test section above.

3. What automated tests I added (or what prevented me from doing so)

   • N/A

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PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

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UI Changes testing checklist:

• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• Talkback.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• Large and small screen sizes. (Tablet and smaller phones)
• Multi-tasking: Split screen and Pop-up view. (Android 10 or higher)

[wzieba]

Looks good!

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr18335-9cecc56
	Commit	9cecc56
	Direct Download	wordpress-prototype-build-pr18335-9cecc56.apk

Note: Google Login is not supported on these builds.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr18335-9cecc56
	Commit	9cecc56
	Direct Download	jetpack-prototype-build-pr18335-9cecc56.apk

Note: Google Login is not supported on these builds.