Bump ratis version to 3.2.1 (#16800)

Author: jt2594838

pom.xml

@@ -144,7 +144,7 @@
       is for ensuring the SNAPSHOT will stay available. We should however have the Ratis folks do a
       new release soon, as releasing with this version is more than sub-ideal.
     -->
-        <ratis.version>3.2.0-3247c7f-SNAPSHOT</ratis.version>
+        <ratis.version>3.2.1</ratis.version>
         <reactive-streams.version>1.0.4</reactive-streams.version>
         <reactor-netty.version>1.1.20</reactor-netty.version>
         <reactor.version>3.5.18</reactor.version>