For GSA#833 make constraint match req, WARN-ERROR

src/validations/constraints/fedramp-external-constraints.xml

@@ -62,7 +62,7 @@
             </let>
             <let var="minor-version-valid" expression="$doc-oscal-version-parts[2] >= $required-doc-oscal-version-parts[2]"/>
             <let var="patch-version-valid" expression="$doc-oscal-version-parts[3] >= $required-doc-oscal-version-parts[3]"/>
-            <expect id="oscal-version-matches-fedramp-version" target="oscal-version" level="WARNING"
+            <expect id="oscal-version-matches-fedramp-version" target="oscal-version" level="ERROR"
                 test="$major-version-valid and $minor-version-valid and $patch-version-valid">
                 <prop namespace="https://docs.oasis-open.org/sarif/sarif/v2.1.0" name="help-url" value="https://docs.oasis-open.org/sarif/sarif/v2.1.0"/>                
                 <message>A FedRAMP document SHOULD have an OSCAL version that matches the minimally required version for FedRAMP packages ({$fedramp-required-minimum-version} not {.}).</message>