chore(deps): update all non-major dependencies

[timoknapp]

This PR contains the following updates:

Package	Type	Update	Change
gradle (source)		patch	6.8.1 -> 6.8.3
http	dependencies	minor	^0.12.0+4 -> ^0.13.0

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Release Notes

gradle/gradle

### [`v6.8.3`](https://togithub.com/gradle/gradle/releases/v6.8.3) This is a patch release for Gradle 6.8. This fixes [a critical bug](https://togithub.com/gradle/gradle/issues/16144) present in Gradle 6.8, 6.8.1 and 6.8.2. [All issues fixed in this patch release](https://togithub.com/gradle/gradle/milestone/171?closed=1) Please don’t use the original 6.8 release or previous patch releases, and instead upgrade to 6.8.3. #### Upgrade Instructions Switch your build to use Gradle 6.8.3 by updating your wrapper: ./gradlew wrapper --gradle-version=6.8.3 --gradle-distribution-sha256-sum 7faa7198769f872826c8ef4f1450f839ec27f0b4d5d1e51bade63667cbccd205 See the [Gradle 6.x upgrade guide](https://docs.gradle.org/6.8.3/userguide/upgrading_version_6.html#changes_6.8) to learn about deprecations, breaking changes and other considerations when upgrading to Gradle 6.8.3. #### Reporting Problems If you find a problem with this release, please file a bug on [GitHub Issues](https://togithub.com/gradle/gradle/issues) adhering to our issue guidelines. If you're not sure you're encountering a bug, please use the [forum](https://discuss.gradle.org/c/help-discuss). ### [`v6.8.2`](https://togithub.com/gradle/gradle/releases/v6.8.2) This is a patch release for Gradle 6.8. This fixes several bugs in Gradle 6.8.1. [All issues fixed in this patch release](https://togithub.com/gradle/gradle/milestone/170?closed=1) Please don’t use the original 6.8 release or the 6.8.1, and instead upgrade to 6.8.2. #### Upgrade Instructions Switch your build to use Gradle 6.8.2 by updating your wrapper: `./gradlew wrapper --gradle-version=6.8.2` See the [Gradle 6.x upgrade guide](https://docs.gradle.org/6.8.2/userguide/upgrading_version_6.html#changes_6.8) to learn about deprecations, breaking changes and other considerations when upgrading to Gradle 6.8.2. #### Reporting Problems If you find a problem with this release, please file a bug on [GitHub Issues](https://togithub.com/gradle/gradle/issues) adhering to our issue guidelines. If you're not sure you're encountering a bug, please use the [forum](https://discuss.gradle.org/c/help-discuss).

dart-lang/http

### [`v0.13.0`](https://togithub.com/dart-lang/http/blob/master/CHANGELOG.md#​0130) [Compare Source](https://togithub.com/dart-lang/http/compare/0.12.2...0.13.0) - Stable null safety release.

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