misc: add changeset

Author: Wodann

.changeset/slimy-ties-remain.md

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+---
+"hardhat": minor
+---
+
+Upgraded EDR to [v0.12.0](https://github.com/NomicFoundation/edr/releases/tag/%40nomicfoundation%2Fedr%400.12.0-alpha.0):
+- Removed support for pre-Byzantium root field from RPC receipts
+- Replaced the Provider constructor with an API for registering and creating chain-specific providers in the EdrContext