Revert "hstack/slapos: version up urllib3 2.0.6"

This reverts commit 453e811d6d384922e1c90919daca7f889364dea5.

stack/slapos.cfg

@@ -372,7 +372,7 @@ tzlocal = 1.5.1
 unicodecsv = 0.14.1
 uri-template = 1.2.0
 uritemplate = 4.1.1
-urllib3 = 2.0.6:whl
+urllib3 = 1.26.12
 wcwidth = 0.2.5
 webcolors = 1.12
 webencodings = 0.5.1
@@ -460,7 +460,6 @@ smmap2 = 2.0.5
 tornado = 6.1
 traitlets = 4.3.3
 uritemplate = 3.0.0
-urllib3 = 1.26.12
 Werkzeug = 1.0.1
 wheel = 0.35.1:whl
 widgetsnbextension = 2.0.0