update changelog and docs yml

Author: joao-r-reis

CHANGELOG.md

@@ -1,5 +1,13 @@
 # ChangeLog - DataStax C# Driver
 
+## 3.21.0
+
+2024-09-09
+
+### New Features
+
+*   [[CSHARP-1014](https://datastax-oss.atlassian.net/browse/CSHARP-1014)] Add support for vector type
+
 ## 3.20.1
 
 2024-03-08

docs.yaml

@@ -58,6 +58,7 @@ api_docs:
   '3.18': http://docs.datastax.com/en/drivers/csharp/3.18
   '3.19': http://docs.datastax.com/en/drivers/csharp/3.19
   '3.20': http://docs.datastax.com/en/drivers/csharp/3.20
+  '3.21': http://docs.datastax.com/en/drivers/csharp/3.21
 checks:
   external_links:
     exclude:
@@ -70,6 +71,8 @@ checks:
       - 'https://twitter.com/datastax'
       - 'https://academy.datastax.com/slack'
 versions:
+  - name: '3.21'
+    ref: '3.21'
   - name: '3.20'
     ref: '3.20'
   - name: '3.19'