build(standardized-auth): move dependencies to pyproject.toml

Matches the layout from #337, where CI installs each example with
pip install -e ".[dev]". Bumps ruff to 0.17.3 to match the others.

Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>

Author: WilliamBergamin

standardized-auth/pyproject.toml

@@ -0,0 +1,19 @@
+[project]
+name = "bolt-python-examples-standardized-auth"
+version = "0.0.0"
+requires-python = ">=3.10"
+dependencies = [
+    "slack_bolt==1.30.0",
+    "slack_cli_hooks==0.3.0",
+    "slack_sdk==3.46.0",
+]
+
+[project.optional-dependencies]
+dev = [
+    "mypy==2.4.0",
+    "pytest==9.1.1",
+    "ruff==0.17.3",
+]
+
+[tool.setuptools.packages.find]
+include = ["src*"]