HBASE-24149 Bump netty version to 4.1.48.Final

closes #16

Signed-off-by: Josh Elser <elserj@apache.org>
Signed-off-by: Sean Busbey <busbey@apache.org>

pom.xml

@@ -128,7 +128,7 @@
     <maven.min.version>3.3.3</maven.min.version>
     <rename.offset>org.apache.hbase.thirdparty</rename.offset>
     <protobuf.version>3.11.4</protobuf.version>
-    <netty.version>4.1.45.Final</netty.version>
+    <netty.version>4.1.48.Final</netty.version>
     <guava.version>28.2-jre</guava.version>
     <commons-cli.version>1.4</commons-cli.version>
     <commons-collections.version>4.4</commons-collections.version>