⬆️ Bump urllib3 from 1.25.3 to 1.25.8 in /src

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.25.3 to 1.25.8.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.25.3...1.25.8)

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

Author: dependabot[bot]

src/requirements.txt

@@ -5,4 +5,4 @@ chardet==3.0.4
 idna==2.8
 requests==2.22.0
 typing==3.7.4.1
-urllib3==1.25.3
+urllib3==1.25.8