[dynamodb] AWS SDK updated to 2.17.102 (#11914)

[dynamodb] AWS SDK updated to 2.17.102 (#11914)

* [dynamodb] Update guide for updating the SDK

Some steps were obsolete and required corrections.

Signed-off-by: Sami Salonen <ssalonen@gmail.com>
* [dynamodb] Update AWS SDK to 2.17.102

- Added NOTICE with all compiled dependencies. Dependencies listed in
  feature.xml are omitted.
- jackson dependency is now provided by AWS SDK as a 'shaded' copy
- log4j version used in tests updated
- Specifying DefaultsMode=STANDARD to make the SDK utilize latest
  recommended parameters. RetryMode is also controlled by DefaultsMode,
  so we avoid setting it explicitly unless overridden by the user.
- Fixed test regressions due to SDK changes

Signed-off-by: Sami Salonen <ssalonen@gmail.com>