Fix EPSS measure labels for consistency (#72)

Rename "Moderate" to "Medium" and "Not available" to "Not found" to
align EPSSMeasure labels with established naming conventions.

Author: timtebeek

src/main/java/io/moderne/devcenter/DependencyVulnerabilityCheck.java

@@ -219,9 +219,9 @@ public static SeverityMeasure ofSeverity(String severity) {
     public enum EPSSMeasure implements DevCenterMeasure {
         Critical("Critical", ">50%"),
         High("High", "10-50%"),
-        Medium("Moderate", "1-10%"),
+        Medium("Medium", "1-10%"),
         Low("Low", "<1%"),
-        NotFound("Not available", "No EPSS score available");
+        NotFound("Not found", "No EPSS score available");
 
         private final String name;
         private final String description;