Fix: Could not pip install .[testing]

The testing dependencies were only available to
Hatch but not declared as project optional
dependencies.

Author: hoh

pyproject.toml

@@ -80,6 +80,16 @@ optional-dependencies.nuls2 = [
 optional-dependencies.polkadot = [
   "substrate-interface>=0.9.27",
 ]
+optional-dependencies.testing = [
+  "ipfshttpclient==0.8.0a2", # eth/web3 test dependency, for some reason"
+  "more-itertools==8.14.0",
+  "pytest==8.0.1",
+  "pytest-cov==4.1.0",
+  "pytest-mock==3.12.0",
+  "pytest-asyncio==0.23.5",
+  "pytest-aiohttp==1.0.5",
+]
+
 urls.Documentation = "https://aleph.im/"
 urls.Homepage = "https://github.com/aleph-im/pyaleph"
 scripts.pyaleph = "aleph.commands:run"
@@ -122,15 +132,7 @@ features = [
   "cosmos",
   "nuls2",
   "polkadot",
-]
-dependencies = [
-  "ipfshttpclient==0.8.0a2", # eth/web3 test dependency, for some reason"
-  "more-itertools==8.14.0",
-  "pytest==8.0.1",
-  "pytest-cov==4.1.0",
-  "pytest-mock==3.12.0",
-  "pytest-asyncio==0.23.5",
-  "pytest-aiohttp==1.0.5",
+  "testing",
 ]
 
 # XXX see https://github.com/aleph-im/pyaleph/blob/main/.github/workflows/pyaleph-ci.yml