fix: use rust:1.89-bookworm image in the rbuilder Dockerfile

[bharath-123]

📝 Summary

#790 updated the rbuilder docker base image to use rust:1.89 which broke the latest develop images with:

/app/rbuilder: /lib/aarch64-linux-gnu/libc.so.6: version `GLIBC_2.38' not found (required by /app/rbuilder)
/app/rbuilder: /lib/aarch64-linux-gnu/libc.so.6: version `GLIBC_2.39' not found (required by /app/rbuilder)

Use rust:1.89-bookworm to fix this issue

✅ I have completed the following steps:

• Run make lint
• Run make test
• Added tests (if applicable)