Bump node from 18.14.0 to 21.7.3

Bumps node from 18.14.0 to 21.7.3.

---
updated-dependencies:
- dependency-name: node
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Dockerfile

@@ -51,7 +51,7 @@ RUN	find /opt/bin -type f ! -name "*.sh" ! -name "livepeer-mist-bigquery-uploade
 FROM	catalyst-${BUILD_TARGET}-build	as	catalyst-build
 
 # Install livepeer-w3 required to use web3.storage
-FROM	node:18.14.0 as node-build
+FROM	node:21.7.3 as node-build
 ARG	LIVEPEER_W3_VERSION=v0.2.2
 WORKDIR /app