Move update-antora-ui-spring.yml to docs-build

So we don't have duplicate workflows between maintenance branches

Issue gh-15106

.github/workflows/update-antora-ui-spring.yml

@@ -1,35 +0,0 @@
-name: Update Antora UI Spring
-
-on:
-  schedule:
-    - cron: '0 10 * * *' # Once per day at 10am UTC
-  workflow_dispatch:
-
-permissions:
-  pull-requests: write
-  issues: write
-  contents: write
-
-jobs:
-  update-antora-ui-spring:
-    runs-on: ubuntu-latest
-    name: Update on Supported Branches
-    strategy:
-      matrix:
-        branch: [ '5.8.x', '6.1.x', '6.2.x', 'main' ]
-    steps:
-      - uses: spring-io/spring-doc-actions/update-antora-spring-ui@5a57bcc6a0da2a1474136cf29571b277850432bc
-        name: Update
-        with:
-          docs-branch: ${{ matrix.branch }}
-          token: ${{ secrets.GITHUB_TOKEN }}
-          antora-file-path: 'docs/antora-playbook.yml'
-  update-antora-ui-spring-docs-build:
-    runs-on: ubuntu-latest
-    name: Update on docs-build
-    steps:
-      - uses: spring-io/spring-doc-actions/update-antora-spring-ui@5a57bcc6a0da2a1474136cf29571b277850432bc
-        name: Update
-        with:
-          docs-branch: 'docs-build'
-          token: ${{ secrets.GITHUB_TOKEN }}