build(deps): update blspy requirement from ~=1.0.2 to ~=2.0.3

Updates the requirements on [blspy](https://github.com/Chia-Network/bls-signatures) to permit the latest version.
- [Release notes](https://github.com/Chia-Network/bls-signatures/releases)
- [Commits](Chia-Network/bls-signatures@1.0.2...2.0.3)

---
updated-dependencies:
- dependency-name: blspy
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,5 +1,5 @@
 git+git://github.com/Chia-Network/chia-blockchain.git@main#egg=chia-blockchain
-blspy~=1.0.2
+blspy~=2.0.3
 setuptools~=56.1.0
 aiosqlite~=0.17.0
 aiohttp~=3.7.4