deps(docker): bump node in /docker/license_extractor (#2696)

Bumps node from 14-alpine to 21-alpine.

---
updated-dependencies:
- dependency-name: node
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docker/license_extractor/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:14-alpine
+FROM node:21-alpine
 RUN npm i -g license-extractor
 RUN mkdir /repo