Bump urllib3 from 2.5.0 to 2.6.0 in /docs (#715)

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docs/requirements.txt

@@ -25,4 +25,4 @@ sphinxcontrib-qthelp==1.0.7
 sphinxcontrib-serializinghtml==1.1.10
 tomli==2.0.1
 typing_extensions==4.11.0
-urllib3==2.5.0
+urllib3==2.6.0