Bump urllib3 from 1.26.6 to 1.26.18 (#244)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.6 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@1.26.6...1.26.18)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -14,5 +14,5 @@ pytest-datadir-ng>=1.1.1
 pytest-lazy-fixture>=0.6.3
 requests>=2.23.0
 spotpy>=1.6.0
-urllib3==1.26.6
+urllib3==1.26.18
 xarray>=0.19

setup.py

@@ -27,7 +27,7 @@
         'pytest-lazy-fixture>=0.6.3',
         'requests>=2.23.0',
         'spotpy>=1.6.0',
-        'urllib3==1.26.6',
+        'urllib3==1.26.18',
         'xarray>=0.19'
     ],
     author='WRF-Hydro Team',