deps(deps): bump node from 25-slim to 26-slim

Bumps node from 25-slim to 26-slim.

---
updated-dependencies:
- dependency-name: node
  dependency-version: 26-slim
  dependency-type: direct:production
...

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

Dockerfile

@@ -1,5 +1,5 @@
 # --- Stage 1: build the Worker with Wrangler -----------------------
-FROM node:25-alpine AS builder
+FROM node:26-alpine AS builder
 
 WORKDIR /app
 
@@ -12,7 +12,7 @@ COPY src ./src
 RUN npx wrangler deploy --dry-run --outdir=dist
 
 # --- Stage 2: minimal runtime with workerd -------------------------
-FROM node:25-slim AS runtime
+FROM node:26-slim AS runtime
 ARG TARGETARCH
 
 # Install ca-certificates for SSL, then install workerd via npm