deps(docker): bump node from 24.18.0-alpine to 26.7.0-alpine

Bumps node from 24.18.0-alpine to 26.7.0-alpine.

---
updated-dependencies:
- dependency-name: node
  dependency-version: 26.7.0-alpine
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Dockerfile

@@ -1,7 +1,7 @@
 # Multi-stage build for Windshift server
 
 # Stage 1: Build frontend
-FROM node:24.18.0-alpine@sha256:a0b9bf06e4e6193cf7a0f58816cc935ff8c2a908f81e6f1a95432d679c54fbfd AS frontend-builder
+FROM node:26.7.0-alpine@sha256:aadf416b2cdce311a8811ba3f0608a61b77dbf997500e2eafe781b51f6a0b019 AS frontend-builder
 
 WORKDIR /build