update nixpkgs

btcpayserver: 1.11.2 -> 1.11.4
clightning: 23.05.2 -> 23.08.1
hwi: 2.2.1 -> 2.3.1

Remove custom coincurve, since nixos-23.05 includes the latest version
of coincurve (18) that's required by pyln-proto.

Co-authored-by: Erik Arvstedt <erik.arvstedt@gmail.com>

pkgs/python-packages/setuptools-rust-hook/setuptools-rust-hook.sh

@@ -0,0 +1,18 @@
+echo "Sourcing setuptools-rust-hook"
+
+setuptoolsRustSetup() {
+    # This can work only if rustPlatform.cargoSetupHook is also included
+    if ! command -v cargoSetupPostPatchHook >/dev/null; then
+        echo "ERROR: setuptools-rust has to be used alongside with rustPlatform.cargoSetupHook!"
+        exit 1
+    fi
+
+    export PYO3_CROSS_LIB_DIR="@pyLibDir@"
+    export CARGO_BUILD_TARGET=@cargoBuildTarget@
+    # TODO theoretically setting linker should not be required because it is
+    # already set in pkgs/build-support/rust/hooks/default.nix but build fails
+    # on missing linker without this.
+    export CARGO_TARGET_@cargoLinkerVar@_LINKER=@targetLinker@
+}
+
+preConfigureHooks+=(setuptoolsRustSetup)