[Bug] "Configure project :barcode_scan2" very slow

[boldt]

Describe the bug

A fresh build of an app using this plugin slows down the build process.

To Reproduce

Bulding an app using this plugin. Run flutter build apk -v. See the logs:

[+27907 ms] > Configure project :barcode_scan2
[        ] The com.google.protobuf plugin was already applied to the project: :barcode_scan2 and will not be applied again after plugin: android-library
[ +686 ms] WARNING: API 'variant.getJavaCompile()' is obsolete and has been replaced with 'variant.getJavaCompileProvider()'.
[        ] It will be removed at the end of 2019.
[        ] For more information, see https://d.android.com/r/tools/task-configuration-avoidance.
[        ] To determine what is calling variant.getJavaCompile(), use -Pandroid.debug.obsoleteApi=true on the command line to display more information.
[+63098 ms] Checking the license for package Android SDK Build-Tools 28.0.3 in /opt/android-sdk-linux/licenses

As you can see, the Configure project :barcode_scan2 needs 63s. (20% of the whole build time)

Expected behavior

The Configure project :barcode_scan2 should be faster, since it slows down the app build drastically.

Screenshots

See To Reproduce

Logs

See To Reproduce

Environment (please complete the following information):

• gitlab-runner with image cirrusci/flutter:2.2.2
• barcode_scan2: ^4.1.3
• flutter: 2.2.2

Additional context

n/a