example(hostname): remove variable hostname from test

Author: divyenduz

examples/pghostname_zig/expected/pghostname_zig_test.out

@@ -1,7 +1,5 @@
 CREATE EXTENSION pghostname_zig;
 SELECT COALESCE(length(pghostname_zig()), 0) > 0;
-INFO:  hostname: ubuntu
-
  ?column? 
 ----------
  t

examples/pghostname_zig/src/main.zig

@@ -10,7 +10,6 @@ comptime {
 fn pghostname_zig() ![]const u8 {
     var buffer: [std.posix.HOST_NAME_MAX]u8 = undefined;
     const hostname = try std.posix.gethostname(&buffer);
-    pgzx.elog.Info(@src(), "hostname: {s}\n", .{hostname});
     return hostname;
 }