Bump urllib3 in /mpcontribs-serverless/dependencies

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.12 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@1.26.12...1.26.18)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: indirect
...

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

mpcontribs-serverless/dependencies/requirements.txt

@@ -47,6 +47,8 @@ emmet-core==0.38.6
     # via mp-api
 envier==0.4.0
     # via ddtrace
+exceptiongroup==1.1.3
+    # via cattrs
 executing==1.2.0
     # via stack-data
 filetype==1.1.0
@@ -201,6 +203,8 @@ rfc3987==1.3.8
     # via jsonschema
 ruamel-yaml==0.17.21
     # via pymatgen
+ruamel-yaml-clib==0.2.8
+    # via ruamel-yaml
 scipy==1.10.0
     # via pymatgen
 semantic-version==2.10.0
@@ -261,7 +265,7 @@ ujson==5.5.0
     # via mpcontribs-client
 uncertainties==3.1.7
     # via pymatgen
-urllib3==1.26.12
+urllib3==1.26.18
     # via requests
 wcwidth==0.2.5
     # via prompt-toolkit