Manual update of pip requirements

Change-Id: I46d9320f86f48090cd6c4aba26118ddb0a641888
Signed-off-by: beierlm <mark.beierl@canonical.com>
diff --git a/tox.ini b/tox.ini
index d4f93f1..4069746 100644
--- a/tox.ini
+++ b/tox.ini
@@ -81,7 +81,7 @@
 
 #######################################################################################
 [testenv:pip-compile]
-deps =  pip-tools==6.4.0
+deps =  pip-tools==6.6.2
 skip_install = true
 whitelist_externals = bash
         [