Update timeline to add 2x (#6563)

release_docs/img/release-schedule.plantuml

@@ -1,39 +1,27 @@
 The release timeline was generated on PlantUML (https://plantuml.com)
 
 The current script:
-
 @startgantt
 
 title HDF5 Release Schedule
 
 projectscale monthly
-Project starts 2023-01-01
+Project starts 2024-09-01
 
-[1.8] starts 2023-01-01 and lasts 5 weeks
-[1.8.23 (EOL)] happens 2023-01-31
-[1.8] is colored in #F76969
-
-[1.10] starts 2023-01-01 and lasts 39 weeks
-[1.10.10] happens 2023-03-31
-[1.10.11 (EOL)] happens 2023-09-30
-[1.10.11 (EOL)] displays on same row as [1.10.10]
-[1.10] is colored in #F6DD60
-
-[1.12] starts 2023-01-01 and lasts 48 weeks
-[1.12.3 (EOL)] happens 2023-11-30
-[1.12] is colored in #88CCEE
-
-[1.14] starts at 2023-01-01 and lasts 110 weeks
-[1.14.1] happens at 2023-04-30
-[1.14.2] happens at 2023-08-31
-[1.14.3] happens at 2023-10-31
+[1.14] starts at 2024-09-01 and lasts 30 weeks
 [1.14.5] happens at 2024-09-30
 [1.14.6 (EOL)] happens at 2025-01-30
-[1.14.1] displays on same row as [1.14.1]
-[1.14.2] displays on same row as [1.14.1]
-[1.14.3] displays on same row as [1.14.1]
-[1.14.5] displays on same row as [1.14.1] 
-[1.14.6 (EOL)] displays on same row as [1.14.1]
-[1.14] is colored in #B187CF
+[1.14.5] displays on same row as [1.14.5]
+[1.14.6 (EOL)] displays on same row as [1.14.5]
+[1.14] is colored in #F76969
+
+[2.x] starts at 2025-01-31 and lasts 90 weeks
+[2.0.0] happens at 2025-10-25
+[2.1.0] happens at 2026-03-03
+[2.2.0] happens at 2026-07-27
+[2.0.0] displays on same row as [2.0.0]
+[2.1.0] displays on same row as [2.0.0]
+[2.2.0] displays on same row as [2.0.0]
+[2.x] is colored in #44ffaa
 
 @endgantt