[NPU] Update compiler version to UD20 RC1 (#35665)
### Details:
- *Bump NPU Compiler to 7_7_0-2996129 (UD20 RC1)*
### Tickets:
- *ticket-id*
### AI Assistance:
- *AI assistance used: no / yes*
- *If yes, summarize how AI was used and what human validation was
performed (build/tests/manual checks).*
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Signed-off-by: Stefania Hergane <stefania-persida.hergane@intel.com>
