chore(deps): bump golang in /threat-network

Bumps golang from 1.26-alpine to 1.27-alpine.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.27-alpine
  dependency-type: direct:production
...

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

Author: dependabot[bot]

threat-network/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.26-alpine AS builder
+FROM golang:1.27-alpine AS builder
 
 # mattn/go-sqlite3 requires CGO (matches the Core backend's SQLite driver).
 RUN apk --no-cache add gcc musl-dev