chore: pin node version in transport interop tests (#2629)

There's a regression in the latest node that causes npm 10.7.0
to fail to install so pin to LTS

Author: achingbrain

interop/Dockerfile

@@ -1,6 +1,6 @@
 # Here because we want to fetch the node_modules within docker so that it's
 # installed on the same platform the test is run. Otherwise tools like `esbuild` will fail to run
-FROM node:22-bullseye-slim
+FROM node:lts
 
 WORKDIR /app