Bump urllib3 from 1.26.12 to 1.26.13 (#1908)

* Bump urllib3 from 1.26.12 to 1.26.13

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.12 to 1.26.13.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/1.26.13/CHANGES.rst)
- [Commits](https://github.com/urllib3/urllib3/compare/1.26.12...1.26.13)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

* Update urllib3==1.26.13

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: JonnyWong16 <9099342+JonnyWong16@users.noreply.github.com>

[skip ci]

lib/urllib3/response.py

@@ -3,6 +3,7 @@ from __future__ import absolute_import
 import io
 import logging
 import sys
+import warnings
 import zlib
 from contextlib import contextmanager
 from socket import error as SocketError
@@ -663,9 +664,21 @@ class HTTPResponse(io.IOBase):
 
     # Backwards-compatibility methods for http.client.HTTPResponse
     def getheaders(self):
+        warnings.warn(
+            "HTTPResponse.getheaders() is deprecated and will be removed "
+            "in urllib3 v2.1.0. Instead access HTTResponse.headers directly.",
+            category=DeprecationWarning,
+            stacklevel=2,
+        )
         return self.headers
 
     def getheader(self, name, default=None):
+        warnings.warn(
+            "HTTPResponse.getheader() is deprecated and will be removed "
+            "in urllib3 v2.1.0. Instead use HTTResponse.headers.get(name, default).",
+            category=DeprecationWarning,
+            stacklevel=2,
+        )
         return self.headers.get(name, default)
 
     # Backwards compatibility for http.cookiejar