Upgrade s3 sdk to 1.12.268

[xjin-Confluent]

Problem

This is to upgrade S3 sdk version

Solution

Does this solution apply anywhere else?

• yes
• no

If yes, where?

CP

Test Strategy

Testing done:

• Unit tests
• Integration tests
• System tests
• Manual tests

Release Plan

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[snehashisp]

LGTM. Please update the title of the PR by adding the version of aws we are updating to. Also we dont need to include 5.4 and 5.5 in the title. Being picky as we auto generate changelog updated from the commit name (which defaults to the title) 😄.