chore: bump app versions

Bump app version as required to pass the check which is done by the
following script:

./scripts/apps-version-check.sh

apps/emqx_oracle/src/emqx_oracle.app.src

@@ -1,6 +1,6 @@
 {application, emqx_oracle, [
     {description, "EMQX Enterprise Oracle Database Connector"},
-    {vsn, "0.2.0"},
+    {vsn, "0.2.1"},
     {registered, []},
     {applications, [
         kernel,