build(deps): bump urllib3 from 2.5.0 to 2.6.0 in /install

Bumps [urllib3](https://github.com/urllib3/urllib3) from 2.5.0 to 2.6.0.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@2.5.0...2.6.0)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-version: 2.6.0
  dependency-type: indirect
...

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

Author: dependabot[bot]

install/requirements.txt

@@ -450,7 +450,7 @@ securesystemslib==1.3.1 \
 sigstore==4.1.0 \
     --hash=sha256:312f7f73fe27127784245f523b86b6334978c555fe4ba7831be5602c089807c1 \
     --hash=sha256:ec3ed0d92bf53ffb23261245a78d4ad3da5af5cc9af889c86461a7d02407249a
-    # via -r install/requirements.in
+    # via -r requirements.in
 sigstore-models==0.0.5 \
     --hash=sha256:8eda90fe16ef3e4e624edd029f4cbbc9832a192dc5c8f66011d94ec4253f9f3f \
     --hash=sha256:ac3ca1554d5dd509a6710699d83a035a09ba112d1fa180959cbfcdd5d97633b7
@@ -477,9 +477,9 @@ typing-inspection==0.4.2 \
     --hash=sha256:4ed1cacbdc298c220f1bd249ed5287caa16f34d44ef4e9c3d0cbad5b521545e7 \
     --hash=sha256:ba561c48a67c5958007083d386c3295464928b01faa735ab8547c5692e87f464
     # via pydantic
-urllib3==2.5.0 \
-    --hash=sha256:3fc47733c7e419d4bc3f6b3dc2b4f890bb743906a30d56ba4a5bfa4bbff92760 \
-    --hash=sha256:e6b01673c0fa6a13e374b50871808eb3bf7046c4b125b216f6bf1cc604cff0dc
+urllib3==2.6.0 \
+    --hash=sha256:c90f7a39f716c572c4e3e58509581ebd83f9b59cced005b7db7ad2d22b0db99f \
+    --hash=sha256:cb9bcef5a4b345d5da5d145dc3e30834f58e8018828cbc724d30b4cb7d4d49f1
     # via
     #   requests
     #   tuf