Bump node from 19 to 20

Bumps node from 19 to 20.

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

Change-Id: I22842af3fdb9ecd118e93ec725009ef17f802383
Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/Dockerfile b/Dockerfile
index f45b390..3652653 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build assets in builder image
-FROM node:19 as assetbuilder
+FROM node:20 as assetbuilder
 
 WORKDIR '/app'