chore: Use 20.18.1 instead of 20.14 as our node base image (#9004)

We already have 20.18.1 set as the default in our Dockerfile, but we
override it with an arg from the workflow, so this brings the workflow
up to date with what we use as our default.

.github/workflows/docker_publish.yaml

@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        version: [ 20.14.0-alpine ]
+        version: [ 20.18.1-alpine ]
     steps:
       - name: Checkout tag v${{ inputs.version }}
         if: ${{ inputs.version != '' }}