refactor: use pynostr/coincurve instead of secp256k1 (#18)

---------

Co-authored-by: Riccardo Balbo <os@rblb.it>
Co-authored-by: Vlad Stan <stan.v.vlad@gmail.com>

pyproject.toml

@@ -7,11 +7,8 @@ authors = [{ name = "Riccardo Balbo", email = "oc@rblb.it" }]
 urls = { Homepage = "https://lnbits.com", Repository = "https://github.com/lnbits/nwcprovider" }
 dependencies = [ "lnbits>1" ]
 
-[tool.poetry]
-package-mode = false
-
-[tool.uv]
-dev-dependencies = [
+[dependency-groups]
+dev = [
     "black",
     "pytest-asyncio",
     "pytest",
@@ -21,12 +18,15 @@ dev-dependencies = [
     "pytest-md",
 ]
 
+[tool.poetry]
+package-mode = false
+
 [tool.mypy]
 plugins = ["pydantic.mypy"]
 
 [[tool.mypy.overrides]]
 module = [
-  "secp256k1.*",
+  "pynostr.*",
 ]
 ignore_missing_imports = "True"