fix: corrected date for OpenMP GPU target offload talk (#236)

The date for talk titled 'OpenMP GPU Target Offload' was wrong. Instead
of year 2023, it should be year 2024.

Author: BabarZKhan

website/content/talks/_index.md

@@ -100,8 +100,8 @@ to [this public calendar](https://calendar.google.com/calendar/u/0?cid=N2EzMDU3N
 * 2024-08-22: Upstream SPIR-V Conversion
 [slides](/OpenMeetings/2024-08-22-Upstream-SPIRV-Conversion.pdf) - 
 [recording](https://youtu.be/-qoMMrlYvGs)
-* 2023-02-15: OpenMP GPU target offload
-[slides](/OpenMeetings/2023-02-15-OpenMP-GPU-Offload.pdf) -
+* 2024-02-15: OpenMP GPU target offload
+[slides](/OpenMeetings/2024-02-15-OpenMP-GPU-Offload.pdf) -
 [recording](https://youtu.be/lOK6JPuVFYg)
 * 2023-12-14: Vector dialect, reshape, and handling of unit dimensions
 [slides](/OpenMeetings/2023-12-14-Vector-reshapes.pdf) -