doc: conf: Add 3.3.0 release to version list

This commit adds the Zephyr 3.3.0 release to the documentation version
list.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

doc/conf.py

@@ -161,6 +161,7 @@
     "current_version": version,
     "versions": (
         ("latest", "/"),
+        ("3.3.0", "/3.3.0/"),
         ("3.2.0", "/3.2.0/"),
         ("3.1.0", "/3.1.0/"),
         ("3.0.0", "/3.0.0/"),