Track last-used case-utils as dependency in dev; mark dev optional

No effects were observed on Make-managed files.

References:
* https://python-poetry.org/docs/managing-dependencies/

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

Author: ajnelson-nist

Makefile

@@ -69,10 +69,8 @@ all: \
 	    pip \
 	    poetry
 	source venv/bin/activate \
-	  && poetry install
-	source venv/bin/activate \
-	  && pip install \
-	    case-utils
+	  && poetry install \
+	    --with dev
 	touch $@
 
 check: \

pyproject.toml

@@ -12,7 +12,11 @@ json5 = "^0.9.25"
 pyqt5 = "^5.15.10"
 argparse = "^1.4.0"
 
+[tool.poetry.group.dev]
+optional = true
+
 [tool.poetry.group.dev.dependencies]
+case-utils = "^0.16"
 mypy = "^1"
 pytest = "^8"