Fix S3 multipart SSE-C integration test broken by new S3 default bucket encryption behavior

[Fred1155]

Motivation and Context

Starting April 6, 2026, AWS S3 began rolling out a new default security setting that automatically disables server-side encryption with customer-provided keys (SSE-C) for all newly created general purpose buckets announcement.

This caused S3MultipartClientPutObjectIntegrationTest.putObject_withSSECAndChecksum_objectSentCorrectly to fail with AccessDeniedException because the test creates a fresh bucket (with no encryption configuration) and then attempts an SSE-C upload, which is now blocked by default.

Modifications

After bucket creation in @BeforeAll, call PutBucketEncryption to explicitly unblock SSE-C on the test bucket by setting BlockedEncryptionTypes to EncryptionType.NONE.
Reference: https://docs.aws.amazon.com/us_en/AmazonS3/latest/userguide/blocking-unblocking-s3-c-encryption-gpb.html

Testing

Local test passed

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed
• I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new file created by the script in .changes/next-release with your changes.
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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