Fix submodule pointer for nats client

Signed-off-by: Johannes Petzold <jpetzold@pivotallabs.com>
Bump executor, inigo, linux-circus, runtime-schema, stager

[delivers #79966200]

Bump cloudfoundry-incubator/executor:
  Amit Gupta:
     Upload the streamed-out file without compressing [#79966200] ( Travis Unknown )
Bump cloudfoundry-incubator/inigo:
  Amit Gupta:
     Fix typo in test comment
     Update executor test since upload action does not compress anymore [#79966200]
Bump cloudfoundry-incubator/linux-circus:
  Amit Gupta:
     Tailor compresses (before executor tries to stream droplet and build artifacts cache out) [#79966200] ( Travis Unknown )
Bump cloudfoundry-incubator/runtime-schema:
  Amit Gupta:
     Add flag for location of compressed build artifacts output [#79966200] ( Travis Unknown )
Bump cloudfoundry-incubator/stager:
  Amit Gupta:
     Upload compressed droplet tar and buildpack cache [#79966200] ( Travis Unknown )