[MINOR] change version to release v0.5.1-rc3 (#3725)

### What changes were proposed in this pull request?

change version to release v0.5.1-rc3

### Why are the changes needed?
change version to release v0.5.1-rc3

### Does this PR introduce _any_ user-facing change?
no

### How was this patch tested?
existing tests

clients/client-python/setup.py

@@ -15,7 +15,7 @@
 setup(
     name="gravitino",
     description="Python lib/client for Gravitino",
-    version="0.5.2.dev1",
+    version="0.5.1",
     long_description=long_description,
     long_description_content_type="text/markdown",
     url="https://github.com/datastrato/gravitino",

gradle.properties

@@ -9,7 +9,7 @@ org.gradle.caching=true
 org.gradle.jvmargs=-Xmx4g
 
 # version that is going to be updated automatically by releases
-version = 0.5.2-SNAPSHOT
+version = 0.5.1
 
 # sonatype credentials
 SONATYPE_USER = admin