Newer Gradle/AGP versions include the following warnings:
```
w: file:///Users/goderbauer/dev/flutter/packages/flutter_tools/gradle/src/main/kotlin/dependency_version_checker.gradle.kts:107:40: Variable 'agpVersion' initializer is redundant
w: file:///Users/goderbauer/dev/flutter/packages/flutter_tools/gradle/src/main/kotlin/dependency_version_checker.gradle.kts:108:40: Variable 'kgpVersion' initializer is redundant
w: file:///Users/goderbauer/dev/flutter/packages/flutter_tools/gradle/src/main/kotlin/dependency_version_checker.gradle.kts:143:28: Parameter 'project' is never used
w: file:///Users/goderbauer/dev/flutter/packages/flutter_tools/gradle/src/main/kotlin/dependency_version_checker.gradle.kts:152:40: Variable 'agpVersion' initializer is redundant
w: file:///Users/goderbauer/dev/flutter/packages/flutter_tools/gradle/src/main/kotlin/dependency_version_checker.gradle.kts:167:55: 'Version' is deprecated. Deprecated in Java
w: file:///Users/goderbauer/dev/flutter/packages/flutter_tools/gradle/src/main/kotlin/dependency_version_checker.gradle.kts:195:56: Unnecessary non-null assertion (!!) on a non-null receiver of type Any
w: file:///Users/goderbauer/dev/flutter/packages/flutter_tools/gradle/src/main/kotlin/dependency_version_checker.gradle.kts:344:28: The corresponding parameter in the supertype 'Comparable' is named 'other'. This may cause problems when calling this function with named arguments.
```
These also get printed out to the CLI, so they are somewhat annoying.
Fixes all of the warnings, except for `'Version' is deprecated. Deprecated in Java`, which gets suppressed (we are intentionally using the deprecated `Version`, to help support older versions of AGP that use that deprecated class).
24979ab2c5