Correction to CI/CD YAML

.gitlab-ci.yml

-image: "python:3.7"
+image: "mcanterb/forge-cicd:latest"
 
 before_script:
   - python3 --version
-  - pip3 install -q asn1tools lxml xmlschema
 
 stages:
-  - Check Schemas
+  - Checks
 
 checkASN1:
-  stage: Check Schemas
+  stage: Checks
   script:
   - python3 testing/check_asn1.py
 
-  checkXSD:
-  stage: Check Schemas
+checkXSD:
+  stage: Checks
   script:
   - python3 testing/check_xsd.py
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