update to mailman3 url

openadk.org/config.toml

@@ -21,7 +21,7 @@ languageCode = "en-us"
     weight = -90
 [[menu.main]]
     name = "Mailinglist"
-    url = "https://mailman.openadk.org/cgi-bin/mailman/listinfo/dev/"
+    url = "https://mailman.openadk.org/mailman3/postorius/lists/dev.openadk.org/"
     weight = -80
 [[menu.main]]
     name = "Git"

uclibc-ng.org/config.toml

@@ -25,7 +25,7 @@ languageCode = "en-us"
     weight = -80
 [[menu.main]]
     name = "Mailinglist"
-    url = "https://mailman.uclibc-ng.org/cgi-bin/mailman/listinfo/devel/"
+    url = "https://mailman.openadk.org/mailman3/postorius/lists/devel.uclibc-ng.org/"
     weight = -70
 [[menu.main]]
     name = "Git"