Merge pull request pulp#499 from dkliban/add-3.26

Adds 3.26 branch to list of branches to build

.ci/scripts/update_ci_branches.py

@@ -3,7 +3,7 @@
 from yaml import safe_load
 from packaging import version
 
-branches = ["3.25", "3.23", "3.21", "3.18", "3.16"]
+branches = ["3.26", "3.25", "3.23", "3.21", "3.18", "3.16"]
 
 # We use this to check if the version is x,y, like a normal branch.
 def isfloat(num):