Upgrade to Gradle 7.6

[MMcM]

There is a good chance that this will OOM, based on gradle/gradle#23215. This is just to confirm one way or the other.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[foundationdb-ci]

Result of fdb-record-layer-pr-proto2 on Linux CentOS 7

• Commit ID: a9aadbb
• Duration 0:15:09
• Result: ❌ FAILED
• Error: Error while executing command: ./gradlew --no-daemon --console=plain -b ./build.gradle build destructiveTest sonarqube -PcoreNotStrict -PreleaseBuild=false -PpublishBuild=false -PspotbugsEnableHtmlReport. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of fdb-record-layer-pr-proto3 on Linux CentOS 7

• Commit ID: a9aadbb
• Duration 0:15:21
• Result: ❌ FAILED
• Error: Error while executing command: ./gradlew --no-daemon --console=plain -b ./build.gradle build destructiveTest sonarqube -PcoreNotStrict -PreleaseBuild=false -PpublishBuild=false -PspotbugsEnableHtmlReport. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[MMcM]

Yes, it does

Execution failed for task ':fdb-record-layer-core:checkstyleMandatory'.
> A failure occurred while executing org.gradle.api.plugins.quality.internal.CheckstyleAction
   > An unexpected error occurred configuring and executing Checkstyle.
      > java.lang.Error: Error was thrown while processing /codebuild/output/src742659734/src/github.com/FoundationDB/fdb-record-layer/fdb-record-layer-core/src/test/java/com/apple/foundationdb/record/provider/foundationdb/indexes/RankIndexTest.java