feat(deps): bump cardano-clusterlib to 0.9.4

Update cardano-clusterlib dependency to version 0.9.4 in pyproject.toml and
poetry.lock for making key mnemonic methods available.

Author: mkoura

poetry.lock

@@ -26,7 +26,7 @@ packages = [{include = "cardano_node_tests"}]
 [tool.poetry.dependencies]
 python = ">=3.11,<4.0"
 allure-pytest = "^2.14.3"
-cardano-clusterlib = "^0.9.3"
+cardano-clusterlib = "^0.9.4"
 cbor2 = "^5.6.5"
 filelock = "^3.18.0"
 hypothesis = "^6.135.17"