[#8557] Upgrade WebHelpers2 2.0 -> 2.1, and its deps: MarkupSafe,six

    WebHelpers2                         2.0 -> 2.1
        MarkupSafe                    2.1.3 -> 2.1.5
        six                          1.16.0 -> no upgrade
diff --git a/requirements.txt b/requirements.txt
index 6dd3ca7..0575b1e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -98,7 +98,7 @@
     #   pypeline
 markdown-checklist==0.4.4
     # via -r requirements.in
-markupsafe==2.1.3
+markupsafe==2.1.5
     # via
     #   -r requirements.in
     #   easywidgets
@@ -251,7 +251,7 @@
     #   bleach
     #   html5lib
     #   tinycss2
-webhelpers2==2.0
+webhelpers2==2.1
     # via -r requirements.in
 webob==1.8.7
     # via