fix: remove HEAD from /receipts controller

backend-services/voting-app/src/main/java/org/cardano/foundation/voting/resource/VoteResource.java

@@ -204,7 +204,7 @@ public ResponseEntity<?> getVoteReceipt(Authentication authentication) {
                         });
     }
 
-    @RequestMapping(value = "/receipts", method = { GET, HEAD }, produces = "application/json")
+    @RequestMapping(value = "/receipts", method = { GET }, produces = "application/json")
     @Timed(value = "resource.vote.receipts", histogram = true)
     @Operation(
             summary = "Retrieve all vote receipts for the authenticated user",