Bump urllib3 from 1.25.7 to 1.25.8 in /apiserver

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.25.7 to 1.25.8.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](https://github.com/urllib3/urllib3/compare/1.25.7...1.25.8)

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

apiserver/requirements.txt

@@ -46,5 +46,5 @@ sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.2
 sphinxcontrib-serializinghtml==1.1.3
 sqlparse==0.3.0
-urllib3==1.25.7
+urllib3==1.25.8
 webencodings==0.5.1