Bump urllib3[secure] from 1.26.5 to 1.26.6 in /tools (#29507)

diff --git a/tools/wptrunner/requirements.txt b/tools/wptrunner/requirements.txt
index a2f0011..0c2d4a4 100644
--- a/tools/wptrunner/requirements.txt
+++ b/tools/wptrunner/requirements.txt
@@ -3,6 +3,6 @@
 mozlog==7.1.0
 mozdebug==0.3.0
 pillow==8.2.0
-urllib3[secure]==1.26.5
+urllib3[secure]==1.26.6
 requests==2.25.1
 six==1.16.0