CR-15435 -- move service-now to debian (#511)

* update image

* bump minor python

Author: yaroslav-codefresh

incubating/service-now/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.10.0a7-alpine3.13
+FROM python:3.10.8-slim-bullseye
 RUN pip3 install requests
 
 COPY lib/snow.py /snow/snow.py

incubating/service-now/step.yaml

@@ -2,7 +2,7 @@ kind: step-type
 version: '1.0'
 metadata:
   name: service-now
-  version: 1.2.1
+  version: 1.2.2
   isPublic: true
   description: Integration with ServiceNow Change Management
   sources:
@@ -86,7 +86,7 @@ spec:
         },
         "SN_IMAGE_VERSION": {
           "type": "string",
-          "default": "1.2.1",
+          "default": "1.2.2",
           "description": "Version of the ServiceNow image to use, Docker image tag."
         },
         "SN_INSTANCE": {