chore(deps): update busybox docker tag to v1.38.0

Dockerfile

@@ -19,7 +19,7 @@
 # =============================================================================
 # Stage 1: Build Tailscale combined binary (cross-compiled, runs natively)
 # =============================================================================
-FROM --platform=$BUILDPLATFORM golang:1.26.4-alpine@sha256:f23e8b227fb4493eabe03bede4d5a32d04092da71962f1fb79b5f7d1e6c2a17f AS builder
+FROM --platform=$BUILDPLATFORM golang:1.26.3-alpine@sha256:91eda9776261207ea25fd06b5b7fed8d397dd2c0a283e77f2ab6e91bfa71079d AS builder
 
 # renovate: datasource=github-releases depName=tailscale packageName=tailscale/tailscale versioning=semver
 ARG TAILSCALE_VERSION=v1.98.5
@@ -199,7 +199,7 @@ RUN printf '%s\n' \
 FROM alpine:3.23.4@sha256:5b10f432ef3da1b8d4c7eb6c487f2f5a8f096bc91145e68878dd4a5019afde11 AS busybox
 
 # renovate: datasource=docker depName=busybox versioning=docker
-ARG BUSYBOX_VERSION=1.37.0
+ARG BUSYBOX_VERSION=1.38.0
 
 RUN apk add --no-cache build-base linux-headers wget bzip2 perl upx