rgw:chksum: pull up aws-sdk-java-v2 and fix S3Builder invocation

rgw:chksum: pull up aws-sdk-java-v2 and fix S3Builder invocation

This commit pulls up aws-sdk-java-v2 to 2.32.2, which has trailing header
formatting previously seen with golang v2 sdk--for which the upstream
*Reef* logic is not present (see prior commit by Yixin Jin).

And it fixes the construction of S3Client to accept endpoint self-signed
certificates--logic which is present in the main function example code
in jcksum.java, but somehow not in putobjects.java (anymore?).

Resolves: rhbz#2392604

Signed-off-by: Matt Benjamin <mbenjamin@redhat.com>
(cherry picked from commit 7c56e11d6a9892d02ec9f750b5b785c501f966a3)