force conan 1.61.0

Makefile.setup

@@ -61,7 +61,7 @@ setup-git:
 .PHONY: setup-conan
 setup-conan:
 	# Install Conan if it is not available.
-	if ! command -v conan >/dev/null 2>&1; then $(PIP) install --user --upgrade "conan<2"; fi
+	if ! command -v conan >/dev/null 2>&1; then $(PIP) install --user --upgrade "conan==1.61.0"; fi
 	# Initialize Conan configuration if it doesn't already exist.
 	#
 	# Since running any conan command, even conan --help creates $(CONAN_DIR)
@@ -143,7 +143,7 @@ install-python-deps::
 	command -v $(PIP) >/dev/null 2>&1
 	$(PIP) install $(PIP_INSTALL_ARGS) \
 		click \
-		"conan<2.0.0" \
+		"conan==1.61.0" \
 		libtmux \
 		toml \
 		pipx \