build(deps): bump github.com/gohugoio/hugo from 0.88.1 to 0.159.2

Bumps [github.com/gohugoio/hugo](https://github.com/gohugoio/hugo) from 0.88.1 to 0.159.2.
- [Release notes](https://github.com/gohugoio/hugo/releases)
- [Commits](gohugoio/hugo@v0.88.1...v0.159.2)

---
updated-dependencies:
- dependency-name: github.com/gohugoio/hugo
  dependency-version: 0.159.2
  dependency-type: indirect
...

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

Author: dependabot[bot]

go.mod

@@ -1,5 +1,3 @@
 module go.thethings.network/docs
 
-go 1.17
-
-require github.com/gohugoio/hugo v0.88.1 // indirect
+go 1.25.0