update swift-jni to latest devel (API enhancements)

[rikner]

Fixes #

Type of change:

Motivation (current vs expected behavior)

Update swift-jni to the latest devel-branch, which has some API enhancements that are handy (e.g. direct access to Java buffer types).
see: SwiftAndroid/swift-jni#18

Please check if the PR fulfills these requirements

• Self-review: I am confident this is the simplest and clearest way to achieve the expected behaviour
• There are no dependencies on other PRs or I have linked dependencies through Zenhub
• The commit messages are clean and understandable
• Tests for the changes have been added (for bug fixes / features)

[codecov]

Codecov Report

Merging #325 (608674d) into master (dede1ce) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #325   +/-   ##
=======================================
  Coverage   51.22%   51.22%           
=======================================
  Files          87       87           
  Lines        2899     2899           
=======================================
  Hits         1485     1485           
  Misses       1414     1414           

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