Fix regex pattern in default.json5 for matching

Author: joecorall

default.json5

@@ -47,7 +47,7 @@
         '/(^|/|\\.)Dockerfile$/'
       ],
       matchStrings: [
-        '([ ]+)?# renovate: datasource=(?<datasource>[a-z-\\.]+?) depName=(?<depName>.+?)(?: packageName=(?<packageName>.+?))?(?: versioning=(?<versioning>[a-z-]+?))?\\s(?:ENV|ARG)? .+?_VERSION=(?<currentValue>.+?)(\\\\s|$)'
+        "([ ]+)?# renovate: datasource=(?<datasource>[a-z-\\.]+?) depName=(?<depName>.+?)(?: packageName=(?<packageName>.+?))?(?: versioning=(?<versioning>[a-z-]+?))?\\s(?:ENV|ARG)? .+?_VERSION=(?<currentValue>.+?)(\\s|$)",
       ],
       versioningTemplate: '{{#if versioning}}{{{versioning}}}{{else}}loose{{/if}}',
     },