#### What type of PR is this?
/kind cleanup
/area core
#### What this PR does / why we need it:
Upgrade Gradle to 8.6 by executing command `./gradlew wrapper --gradle-version=8.6` according to <https://github.com/gradle/gradle/releases/tag/v8.6.0>.
#### Does this PR introduce a user-facing change?
```release-note
升级 Gradle 至 8.6
```
#### What type of PR is this?
/kind cleanup
/area core
/milestone 2.11.x
#### What this PR does / why we need it:
Upgrade to Gradle 8.4 by executing command `./gradlew wrapper --gradle-version 8.4 --distribution-type all`.
See https://docs.gradle.org/8.4/release-notes.html for more.
#### Does this PR introduce a user-facing change?
```release-note
升级 Gradle 至 8.4
```
#### What type of PR is this?
/kind cleanup
/area core
#### What this PR does / why we need it:
Upgrade to Gradle 8.0.2 by using command `./gradlew wrapper --gradle-version 8.0.2 --distribution-type bin`.
Recently, we have a plan to restructure our project via Gradle 8, so I upgrade to Gradle 8.0.2 now.
#### Does this PR introduce a user-facing change?
```release-note
None
```
John Niang