feat: extract artifactory timestamps from columns (#33187)

lib/modules/datasource/artifactory/__fixtures__/releases-as-files.html

@@ -11,9 +11,9 @@
        <pre>
          <a href="..">..</a>
          <a href="1.0.0">1.0.0</a>  21-Jul-2021 20:08    -
-         <a href="1.0.1">1.0.1</a>  23-Aug-2021 20:03    -
-         <a href="1.0.2">1.0.2</a>  21-Jul-2021 20:09    -
-         <a href="1.0.3">1.0.3</a>  06-Feb-2021 09:54    -
+         <a href="1.0.1">1.0.1</a>  23-Aug-2021 20:03    12 MB
+         <a href="1.0.2">1.0.2</a>  21-Jul-2021 20:09    123.45 GB
+         <a href="1.0.3">1.0.3</a>  06-Feb-2021 09:54    9.0 KB
        </pre>
        <hr/>
        <address style="font-size:small;">Artifactory Port 8080</address>

lib/modules/datasource/artifactory/index.ts

@@ -114,6 +114,9 @@ export class ArtifactoryDatasource extends Datasource {
   }
 
   private static parseReleaseTimestamp(rawText: string): string {
-    return rawText.trim().replace(regEx(/ ?-$/), '') + 'Z';
+    return (
+      rawText.split(regEx(/\s{2,}/)).filter((e) => !isNaN(Date.parse(e)))[0] +
+      'Z'
+    );
   }
 }