Update urllib3 to 2.6.0+

This dependency update prevents a
malicious compression exploit as
documented in CVE-2025-66418.

https://nvd.nist.gov/vuln/detail/CVE-2025-66418

Author: kstribrnAmzn

link-verifier/requirements.txt

@@ -6,4 +6,4 @@ idna==3.7
 requests==2.32.4
 soupsieve==2.1
 termcolor==1.1.0
-urllib3>=2.0.7
+urllib3>=2.6.0