update CHANGELOG and bump version to 6.21.3 (#1997)

Author: xrmx

CHANGELOG.asciidoc

@@ -32,6 +32,14 @@ endif::[]
 [[release-notes-6.x]]
 === Python Agent version 6.x
 
+[[release-notes-6.21.3]]
+==== 6.21.3 - 2024-03-08
+
+[float]
+===== Bug fixes
+
+* Fix artifacts download in CI workflows {pull}1996[#1996]
+
 [[release-notes-6.21.2]]
 ==== 6.21.2 - 2024-03-07
 

elasticapm/version.py

@@ -28,5 +28,5 @@
 #  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 #  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-__version__ = (6, 21, 2)
+__version__ = (6, 21, 3)
 VERSION = ".".join(map(str, __version__))