Bump future from 0.18.2 to 0.18.3 in /examples/research_projects/lxmert (#21169)

Bumps [future](https://github.com/PythonCharmers/python-future) from 0.18.2 to 0.18.3.
- [Release notes](https://github.com/PythonCharmers/python-future/releases)
- [Changelog](https://github.com/PythonCharmers/python-future/blob/master/docs/changelog.rst)
- [Commits](https://github.com/PythonCharmers/python-future/compare/v0.18.2...v0.18.3

)

---
updated-dependencies:
- dependency-name: future
  dependency-type: direct:production
...
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examples/research_projects/lxmert/requirements.txt

@@ -19,7 +19,7 @@ distlib==0.3.0
 distro==1.4.0
 entrypoints==0.3
 filelock==3.0.12
-future==0.18.2
+future==0.18.3
 html5lib==1.0.1
 idna==2.8
 ipaddr==2.2.0