Update version

ChangeLog.md

@@ -1,4 +1,4 @@
-# 10.2.1 - TBD
+# 10.2.1 - 2024-01-03
 
 -   Fixed ABI compatibility with earlier 10.x versions
     (https://github.com/fmtlib/fmt/pull/3786). Thanks @saraedum.

doc/build.py

@@ -9,7 +9,7 @@ versions = [
   '5.2.0', '5.2.1', '5.3.0', '6.0.0', '6.1.0', '6.1.1', '6.1.2', '6.2.0',
   '6.2.1', '7.0.0', '7.0.1', '7.0.2', '7.0.3', '7.1.0', '7.1.1', '7.1.2',
   '7.1.3', '8.0.0', '8.0.1', '8.1.0', '8.1.1', '9.0.0', '9.1.0']
-versions += ['10.0.0', '10.1.0', '10.1.1', '10.1.1', '10.2.0']
+versions += ['10.0.0', '10.1.0', '10.1.1', '10.1.1', '10.2.0', '10.2.1']
 
 class Pip:
   def __init__(self, venv_dir):