fix: handle PATH correctly in Makefile

Makefile

@@ -3,7 +3,7 @@ MAKEFLAGS += --no-print-directory
 DEV_BIN_DIR := .cargo/bin
 CYAN := \033[36m
 RESET := \033[0m
-export PATH := $(DEV_BIN_DIR):$(PATH)
+PATH := $(DEV_BIN_DIR):$(PATH)
 
 .PHONY: help build build.docs fix fmt lint setup test
 
@@ -20,10 +20,10 @@ build.docs: ## build the documentation
 	@cargo doc --no-deps --all-features
 
 check: ## check that all files match formatting rules
-	@.cargo/bin/dprint check
+	@PATH=$(PATH) dprint check
 
 commit: ## make conventional commit
-	@.cargo/bin/convco commit
+	@PATH=$(PATH) convco commit
 
 docs: ## build & open the documentation in the browser
 	@cargo doc --no-deps --open --all-features
@@ -32,7 +32,7 @@ fix: ## apply lint suggestions
 	@cargo clippy --all-targets --all-features --workspace --fix
 
 fmt: ## format all files
-	@.cargo/bin/dprint fmt
+	@PATH=$(PATH) dprint fmt
 
 lint: ## lint code
 	@cargo clippy --all-targets --all-features --workspace