Bump make test timeout (thanos-io#6276)

Signed-off-by: Douglas Camata <159076+douglascamata@users.noreply.github.com>

Makefile

@@ -308,7 +308,7 @@ test: export THANOS_TEST_ALERTMANAGER_PATH= $(ALERTMANAGER)
 test: check-git install-tool-deps
 	@echo ">> install thanos GOOPTS=${GOOPTS}"
 	@echo ">> running unit tests (without /test/e2e). Do export THANOS_TEST_OBJSTORE_SKIP=GCS,S3,AZURE,SWIFT,COS,ALIYUNOSS,BOS,OCI if you want to skip e2e tests against all real store buckets. Current value: ${THANOS_TEST_OBJSTORE_SKIP}"
-	@go test $(shell go list ./... | grep -v /vendor/ | grep -v /test/e2e);
+	@go test -timeout 15m $(shell go list ./... | grep -v /vendor/ | grep -v /test/e2e);
 
 .PHONY: test-local
 test-local: ## Runs test excluding tests for ALL  object storage integrations.