Update limits.md

Update maximum memory for free users to 8192MB

Author: 0xsasky

sources/platform/limits.md

@@ -43,12 +43,12 @@ The tables below demonstrate the Apify platform's default resource limits. For A
         </tr>
         <tr>
             <td>Run maximum memory</td>
-            <td>4,096&nbsp;MB</td>
+            <td>8,192&nbsp;MB</td>
             <td colspan="3">32,768&nbsp;MB</td>
         </tr>
         <tr>
             <td>Maximum combined memory of all running jobs</td>
-            <td>4,096&nbsp;MB</td>
+            <td>8,192&nbsp;MB</td>
             <td>32,768&nbsp;MB</td>
             <td colspan="2">131,072&nbsp;MB</td>
         </tr>