feat: add @shuheiktgw as maintainer :tada: (#2459)

Signed-off-by: Moritz Johner <beller.moritz@googlemail.com>

.github/PAUL.yaml

@@ -5,6 +5,7 @@ maintainers:
 - sebagomez
 - rodrmartinez
 - IdanAdar
+- shuheiktgw
 # Emeritus Approvers
 - Flydiverny
 - silasbw