MINOR: [Java] Bump maven.version from 3.3.9 to 3.9.6 in /java#39371

dependabot[bot] wants to merge 1 commit intomainapache/arrow:mainfrom

dependabot/maven/java/maven.version-3.9.6apache/arrow:dependabot/maven/java/maven.version-3.9.6Copy head branch name to clipboard