fix: font validation

This patch removes the dictionary validation for type 3 font objects for
their additional resources. This change fixes stack overflow issues with
some documents.

pkg/pdfcpu/validate/font.go

@@ -953,16 +953,10 @@ func validateType3FontDict(xRefTable *model.XRefTable, d types.Dict) error {
 	}
 
 	// Resources, optional, dict, since V1.2
-	d1, err := validateDictEntry(xRefTable, d, dictName, "Resources", OPTIONAL, model.V12, nil)
+	_, err = validateDictEntry(xRefTable, d, dictName, "Resources", OPTIONAL, model.V12, nil)
 	if err != nil {
 		return err
 	}
-	if d1 != nil {
-		_, err := validateResourceDict(xRefTable, d1)
-		if err != nil {
-			return err
-		}
-	}
 
 	// ToUnicode, optional, stream
 	_, err = validateStreamDictEntry(xRefTable, d, dictName, "ToUnicode", OPTIONAL, model.V12, nil)