Update web, use centrally defined version (#6500)

.github/actions/build-variant/action.yml

@@ -43,6 +43,13 @@ runs:
       id: base
       uses: ./.github/actions/setup-base
 
+    - name: Get web ui version
+      if: inputs.include-web-ui == 'true'
+      id: webver
+      shell: bash
+      run: |
+        echo "ver=$(cat bin/web.version)" >> $GITHUB_OUTPUT
+
     - name: Pull web ui
       if: inputs.include-web-ui == 'true'
       uses: dsaltares/fetch-gh-release-asset@master
@@ -51,7 +58,7 @@ runs:
         file: build.tar
         target: build.tar
         token: ${{ inputs.github_token }}
-        version: tags/v2.5.3
+        version: tags/v${{ steps.webver.outputs.ver }}
 
     - name: Unpack web ui
       if: inputs.include-web-ui == 'true'