Fix new linter errors

lib/config-utils.js

@@ -419,7 +419,7 @@ function parsePacksSpecification(packStr) {
         try {
             new semver.Range(version);
         }
-        catch (e) {
+        catch {
             // The range string is invalid. OK to ignore the caught error
             throw new util_1.ConfigurationError(getPacksStrInvalid(packStr));
         }
@@ -503,7 +503,7 @@ function parseRegistries(registriesInput) {
             ? yaml.load(registriesInput)
             : undefined;
     }
-    catch (e) {
+    catch {
         throw new util_1.ConfigurationError("Invalid registries input. Must be a YAML string.");
     }
 }