Bump spotbugs to 4.9.3

[Tobianas]

Bump and adopt changes

[gemini-code-assist]

Summary of Changes

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This pull request primarily focuses on enhancing code quality and maintainability by upgrading the static analysis tool SpotBugs to its latest version. Concurrently, it refactors exception handling across the codebase, replacing generic RuntimeException with the more semantically appropriate IllegalStateException for conditions that signify an invalid application state. These changes contribute to a more robust and predictable system by clarifying error conditions and leveraging updated tooling.

Highlights

• SpotBugs Version Bump: The SpotBugs Maven plugin and its core dependency have been updated to version 4.9.3.2 and 4.9.3 respectively, ensuring the use of the latest static analysis capabilities.
• Exception Handling Refinement: Multiple instances of RuntimeException have been replaced with IllegalStateException across various modules. This change provides more specific exception handling for unrecoverable errors that indicate an invalid state rather than a general runtime issue.
• Code Clean-up: Several @SuppressFBWarnings annotations and an unused import have been removed, improving code clarity and reducing potential false positives from static analysis tools.
• API Contract Update: The shutdown() method in the LightyModule interface no longer declares throws Exception, simplifying its API contract and indicating that implementers should handle exceptions internally or wrap them in more specific runtime exceptions.

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[gemini-code-assist]

Code Review

This pull request updates the SpotBugs dependency to version 4.9.3 and applies the necessary code changes to address new warnings. The changes are consistent across the codebase and include replacing generic RuntimeExceptions with the more specific IllegalStateException, which better reflects the nature of the errors being handled. Additionally, several @SuppressFBWarnings annotations that are no longer necessary with the updated tool version have been removed, and a throws Exception clause has been correctly removed from an asynchronous method's signature. These changes improve code quality and clarity. The pull request is well-executed, and I have no further comments.