ORC-1238: Update DOAP with 1.7.5

### What changes were proposed in this pull request?
This PR aims to update DOAP with 1.7.5

### Why are the changes needed?
To keep DOAP up to date.

### How was this patch tested?
Manually.

Closes #1209 from williamhyun/DOAP.

Authored-by: William Hyun <william@apache.org>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>

site/doap_orc.rdf

@@ -45,8 +45,8 @@ the values that are required for the current query.</description>
     <release>
       <Version>
         <name>Latest release</name>
-        <created>2022-04-15</created>
-        <revision>1.7.4</revision>
+        <created>2022-06-16</created>
+        <revision>1.7.5</revision>
       </Version>
       <Version>
         <name>Stable release</name>