Rm testing artifacts from example manifest

Author: johnwparent

gpt4all-updater/tmp/manifest.xml

@@ -10,8 +10,8 @@
         <last-compatible-version>1.0.0</last-compatible-version>
         <entity>Nomic</entity>
         <pkg-manifest>
-            <installer-uri>file:///Users/john.parent/Downloads/gpt4all-installer-darwin.dmg</installer-uri>
-            <sha256>87d593690be20e1dd6870b9d495ca6a17a581d5b1323f90bd755003658d51881</sha256>
+            <installer-uri>REPLACE-ME</installer-uri>
+            <sha256>REPLACE-ME</sha256>
             <signed>False</signed>
         </pkg-manifest>
     </pkg-description>