🧹 remove unused polling variables

[sebastianMindee]

Description

• ⬆️ bump dependency to cover vulnerability

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Requires a change to the official Guide documentation.

[Copilot]

🟡 Changes recommended

It introduces an undocumented breaking/behavior change by removing polling backoff support from both the public API and the client polling behavior.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR updates the v2 Java client by simplifying async job polling configuration/behavior (removing backoff-related options and tests) and bumping the Apache HttpClient 5 dependency version to address a reported vulnerability.

Changes:

• Remove exponential-backoff support from PollingOptions (fields/validation) and from MindeeClient polling logic.
• Update unit tests to reflect the reduced polling surface (cancellation-only coverage).
• Bump org.apache.httpcomponents.client5:httpclient5 from 5.4.4 to 5.6.3.

File summaries

File	Description
src/main/java/com/mindee/v2/MindeeClient.java	Removes backoff interval growth; polling now uses a fixed interval.
src/main/java/com/mindee/v2/clientoptions/PollingOptions.java	Removes backoff-related options from the public polling options API.
src/test/java/com/mindee/v2/MindeeClientTest.java	Drops backoff-related test and updates polling display name.
src/test/java/com/mindee/v2/clientoptions/PollingOptionsTest.java	Removes backoff assertions and validation tests.
pom.xml	Upgrades HttpClient 5 version property.

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 2
• Review effort level: Lite

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