Prepare release v2024.4 (#5811)

CHANGES

@@ -1,5 +1,19 @@
 Revision history for SPIRV-Tools
 
+v2024.4 2024-09-19
+  - General
+    - Add FPEncoding operand type. (#5726)
+    - Support SPV_KHR_untyped_pointers (#5736)
+    - add support for SPV_INTEL_global_variable_host_access (#5786)
+  - Optimizer
+    - Add knowledge of cooperative matrices (#5720)
+    - Add struct-packing pass and unit test. (#5778)
+  - Validator
+    - Validate presence of Stride operand to OpCooperativeMatrix{Load,Store}KHR (#5777)
+    - Update sampled image validation (#5789)
+  - Linker
+    - allow linking functions with different pointer arguments (#5534)
+
 v2024.3 2024-06-20
   - General
   - Optimizer