Use try-with-resources in WKT and WKB readers

[Oz-er]

Summary

This PR simplifies resource management in WKTFileReader and WKBHexFileReader.

Changes

• Replaced nested try/finally blocks with try-with-resources.
• Kept reader cleanup behavior unchanged.
• Kept the change localized to the two reader classes.

Rationale

Both classes used similar manual resource-closing logic. Try-with-resources makes the cleanup behavior clearer and
less error-prone while preserving existing behavior.

Validation

Ran:

mvn -pl modules/core verify

Result:

- Checkstyle: 0 violations
- Tests run: 2294
- Failures: 0
- Errors: 0
- PMD completed
- Build successful