Update release schedule (#3259)

Author: wwbmmm

community/release_schedule.md

@@ -19,3 +19,9 @@
 |1.14.0|2025-07-xx|王伟冰|
 |1.15.0|2025-10-xx|刘帅|
 |1.16.0|2026-01-xx|王晓峰|
+|1.17.0|2026-05-xx|胡希国|
+|1.18.0|2026-09-xx|陈光明|
+|1.19.0|2027-01-xx|李磊|
+|1.20.0|2027-05-xx|王伟冰|
+|1.21.0|2027-09-xx|刘帅|
+|1.22.0|2028-01-xx|王晓峰|