Bump irc3 from 1.1.5 to 1.1.6 in /src/requirements (#535)

Bumps [irc3](https://github.com/gawel/irc3) from 1.1.5 to 1.1.6.
- [Release notes](https://github.com/gawel/irc3/releases)
- [Changelog](https://github.com/gawel/irc3/blob/master/CHANGES.rst)
- [Commits](https://github.com/gawel/irc3/compare/1.1.5...1.1.6)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

src/requirements/production.txt

@@ -21,7 +21,7 @@ graphene-django==2.10.1
 html5lib==1.0.1
 icalendar==4.0.6
 ipython==7.15.0
-irc3==1.1.5
+irc3==1.1.6
 lxml==4.5.1
 olefile==0.46
 Pillow==7.1.2