3.x: Update guava to 33.3.1-jre

[dkropachev]

The goal is to fixe ~8 vulnurabilities that comming from guava dependency.
This PR does the following:

1. Drops GuavaCompatibility
2. Updates documentation to reflect that it targets only one version of guava
3. Updates guava to 33.3.1-jre

[Copilot]

Pull request overview

This PR updates the Guava dependency from version 19.0 to 33.3.1-jre to address approximately 8 security vulnerabilities. The update includes removing legacy compatibility code for older Guava versions (< 19.0) and migrating from deprecated APIs to their modern equivalents.

• Updates Guava dependency version from 19.0 to 33.3.1-jre
• Removes legacy compatibility layer for Guava versions below 19.0
• Migrates from deprecated immediateCheckedFuture to immediateFuture API

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
pom.xml	Updates Guava version property and Javadoc API documentation link to 33.3.1-jre
driver-core/src/main/java/com/datastax/driver/core/GuavaCompatibility.java	Removes legacy Guava < 19 compatibility code, simplifies version detection, removes unused imports, and updates documentation
driver-core/src/test/java/com/datastax/driver/core/AbstractReconnectionHandlerTest.java	Migrates from deprecated Futures.immediateCheckedFuture() to Futures.immediateFuture()

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 31 out of 31 changed files in this pull request and generated 1 comment.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[dkropachev]

@sylwiaszunejko , could you please take a look at it