[infra] update poetry if necessary (#1656)

make install should use the correct poetry version

Previously, make install just check if `poetry` was installed and might
run with an older version. This would lead to a lot of changes in the
poetry.lock file and merge conflicts for other PRs

Author: kevinjqliu

Makefile

@@ -19,13 +19,20 @@
 help:  ## Display this help
 	@awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n  make \033[36m\033[0m\n"} /^[a-zA-Z_-]+:.*?##/ { printf "  \033[36m%-20s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } ' $(MAKEFILE_LIST)
 
-install-poetry:  ## Install poetry if the user has not done that yet.
-	 @if ! command -v poetry &> /dev/null; then \
-         echo "Poetry could not be found. Installing..."; \
-         pip install --user poetry==2.0.1; \
-     else \
-         echo "Poetry is already installed."; \
-     fi
+POETRY_VERSION = 2.0.1
+install-poetry:  ## Ensure Poetry is installed and the correct version is being used.
+	@if ! command -v poetry &> /dev/null; then \
+		echo "Poetry could not be found. Installing..."; \
+		pip install --user poetry==$(POETRY_VERSION); \
+	else \
+		INSTALLED_VERSION=$$(pip show poetry | grep Version | awk '{print $$2}'); \
+		if [ "$$INSTALLED_VERSION" != "$(POETRY_VERSION)" ]; then \
+			echo "Poetry version $$INSTALLED_VERSION does not match required version $(POETRY_VERSION). Updating..."; \
+			pip install --user --upgrade poetry==$(POETRY_VERSION); \
+		else \
+			echo "Poetry version $$INSTALLED_VERSION is already installed."; \
+		fi \
+	fi
 
 install-dependencies: ## Install dependencies including dev, docs, and all extras
 	poetry install --all-extras