update sdk to 3.2.4

Signed-off-by: bblfsh-release-bot <release-bot@bblf.sh>

pin the openjdk image version

Signed-off-by: Denys Smirnov <denys@sourced.tech>

switch to go modules

Signed-off-by: Denys Smirnov <denys@sourced.tech>

update sdk version and add unicode fixture

Signed-off-by: Denys Smirnov <denys@sourced.tech>

update sdk version

Signed-off-by: Denys Smirnov <denys@sourced.tech>

Merge pull request #29 from bzz/fix-npe-27

Fix native driver NPE

update sdk version

Signed-off-by: Denys Smirnov <denys@sourced.tech>

Merge pull request #26 from juanjux/update_sdk2

Update SDK, fix now-not-silently-dropped fields

Merge pull request #24 from juanjux/memory_issue

Native + annotations fixes, sdk update.

Merge pull request #23 from juanjux/avoid_memorystream

Avoid memorystream