docs: close the 23.2 cycle
There won't be any more 23.2.x releases.
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26988>
diff --git a/docs/release-calendar.csv b/docs/release-calendar.csv
index 032892c..fd8cb80 100644
--- a/docs/release-calendar.csv
+++ b/docs/release-calendar.csv
@@ -1,6 +1,3 @@
-23.2,2023-07-19,23.2.0-rc2,Dylan Baker
-,2023-07-26,23.2.0-rc3,Dylan Baker
-,2023-08-02,23.2.0-rc4,Dylan Baker,or 23.2.0 final
23.3,2024-01-24,23.3.4,Eric Engestrom
,2024-02-07,23.3.5,Eric Engestrom
,2024-02-21,23.3.6,Eric Engestrom
