makefile: increase conformance timeout

increase conformance timeout from `30min` -> `45min`.

[NO NEW TESTS NEEDED]

Signed-off-by: Aditya R <arajan@redhat.com>

Makefile

@@ -167,7 +167,7 @@ install.runc:
 
 .PHONY: test-conformance
 test-conformance:
-	$(GO_TEST) -v -tags "$(STORAGETAGS) $(SECURITYTAGS)" -cover -timeout 20m ./tests/conformance
+	$(GO_TEST) -v -tags "$(STORAGETAGS) $(SECURITYTAGS)" -cover -timeout 60m ./tests/conformance
 
 .PHONY: test-integration
 test-integration: install.tools