Pin oapi generator version

Author: sjmiller609

Makefile

@@ -9,13 +9,14 @@ $(BIN_DIR):
 
 # Local binary paths
 OAPI_CODEGEN ?= $(BIN_DIR)/oapi-codegen
+OAPI_CODEGEN_VERSION ?= v2.5.1
 AIR ?= $(BIN_DIR)/air
 WIRE ?= $(BIN_DIR)/wire
 XCADDY ?= $(BIN_DIR)/xcaddy
 
 # Install oapi-codegen
 $(OAPI_CODEGEN): | $(BIN_DIR)
-	GOBIN=$(BIN_DIR) go install github.com/oapi-codegen/oapi-codegen/v2/cmd/oapi-codegen@latest
+	GOBIN=$(BIN_DIR) go install github.com/oapi-codegen/oapi-codegen/v2/cmd/oapi-codegen@$(OAPI_CODEGEN_VERSION)
 
 # Install air for hot reload
 $(AIR): | $(BIN_DIR)