Bump subprocess32 from 3.2.7 to 3.5.4

Bumps [subprocess32](https://github.com/google/python-subprocess32) from 3.2.7 to 3.5.4.
- [Release notes](https://github.com/google/python-subprocess32/releases)
- [Changelog](https://github.com/google/python-subprocess32/blob/master/ChangeLog)
- [Commits](google/python-subprocess32@3.2.7...3.5.4)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

requirements.txt

@@ -38,7 +38,7 @@ docker-py==1.10.6
 # p3json
 # proc
 # strutil
-subprocess32==3.2.7
+subprocess32==3.5.4
 
 
 numpy==1.16.3