make: disable mod=vendor

It's going to be done temporarily only.

Makefile

@@ -37,7 +37,7 @@ fmt: ## Format source code
 .PHONY: check
 check: ## Perform static code analysis
 check: .check-go-version .check-copyright .check-comments \
-.check-log-capital-letter .check-timeutc .check-lint .check-vendor
+.check-log-capital-letter .check-timeutc .check-lint
 
 .PHONY: .check-go-version
 .check-go-version:
@@ -181,7 +181,7 @@ dev-env-status:  ## Checks status of docker containers and cluster nodes
 .PHONY: build-agent
 build-agent: ## Build development agent binary
 	@echo "==> Building agent"
-	@CGO_ENABLED=0 GOOS=linux go build -trimpath -mod=vendor -o ./scylla-manager-agent.dev ./pkg/cmd/agent
+	@CGO_ENABLED=0 GOOS=linux go build -trimpath -o ./scylla-manager-agent.dev ./pkg/cmd/agent
 
 .PHONY: deploy-agent
 deploy-agent: build-agent ## Deploy it to testing containers
@@ -193,12 +193,12 @@ build-cli: ## Build development cli binary
 build-cli: OUTPUT=./sctool.dev
 build-cli:
 	@echo "==> Building sctool"
-	@go build -trimpath -mod=vendor -o $(OUTPUT) ./pkg/cmd/sctool
+	@go build -trimpath -o $(OUTPUT) ./pkg/cmd/sctool
 
 .PHONY: build-server
 build-server: ## Build development server
 	@echo "==> Building scylla-manager"
-	@CGO_ENABLED=0 GOOS=linux go build -trimpath -mod=vendor -o ./scylla-manager.dev ./pkg/cmd/scylla-manager
+	@CGO_ENABLED=0 GOOS=linux go build -trimpath -o ./scylla-manager.dev ./pkg/cmd/scylla-manager
 
 .PHONY: clean-server
 clean-server: ## Remove development server container
@@ -232,7 +232,7 @@ docs: build ## Update docs/source with generated code
 .PHONY: filler-tool
 filler-tool: ## Build "filler" tool
 	@echo "==> Building filler"
-	@go build -trimpath -mod=vendor ./pkg/tools/filler/cmd/filler
+	@go build -trimpath ./pkg/tools/filler/cmd/filler
 
 .PHONY: clean
 clean: ## Remove dev build artifacts (*.dev files)