[GEARPUMP-326] Upgrade Akka to 2.5.13 (remove akkastream module tempo…

[manuzhang]

…rarily)

Be sure to do all of the following to help us incorporate your contribution
quickly and easily:

• Make sure the commit message is formatted like:
  [GEARPUMP-<Jira issue #>] Meaningful description of pull request
• Make sure tests pass via sbt clean test.
• Make sure old documentation affected by the pull request has been updated and new documentation added for new functionality.

[codecov-io]

Codecov Report

Merging #250 into master will decrease coverage by 0.16%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #250      +/-   ##
==========================================
- Coverage   68.51%   68.35%   -0.17%     
==========================================
  Files         195      195              
  Lines        6235     6234       -1     
  Branches      540      541       +1     
==========================================
- Hits         4272     4261      -11     
- Misses       1963     1973      +10

[manuzhang]

R: @huafengw

[huafengw]

+1