Bump urllib3 from 1.26.5 to 1.26.18

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.5 to 1.26.18.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.5...1.26.18)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: direct:production
...

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

requirements.txt

@@ -104,7 +104,7 @@ trio==0.20.0
 typing==3.7.4.3
 typing_extensions==4.1.1
 ujson==5.1.0
-urllib3==1.26.9
+urllib3==1.26.18
 validators==0.18.2
 w3lib==1.22.0
 websockets==9.1

scheduler/requirements.txt

@@ -7,5 +7,5 @@ kafka-python==2.0.2
 lxml==4.6.3
 requests==2.25.1
 ujson==4.0.2
-urllib3==1.26.5
+urllib3==1.26.18
 coolname==1.1.0

writer/requirements.txt

@@ -7,5 +7,5 @@ kafka-python==2.0.2
 lxml==4.6.3
 requests==2.25.1
 ujson==4.0.2
-urllib3==1.26.5
+urllib3==1.26.18
 coolname==1.1.0