PYTHON-5336 Added VECTOR_SUBTYPE line to API docs (mongodb#2313) [v4.12] (mongodb#2314)

Co-authored-by: Casey Clements <caseyclements@users.noreply.github.com>

Author: mongodb-drivers-pr-bot[bot]

doc/api/bson/binary.rst

@@ -16,6 +16,7 @@
    .. autodata:: MD5_SUBTYPE
    .. autodata:: COLUMN_SUBTYPE
    .. autodata:: SENSITIVE_SUBTYPE
+   .. autodata:: VECTOR_SUBTYPE
    .. autodata:: USER_DEFINED_SUBTYPE
 
    .. autoclass:: UuidRepresentation