chore(deps): bump the go-modules-updates group

Bumps the go-modules-updates group in /backend with 2 updates: [github.com/alecthomas/chroma/v2](https://github.com/alecthomas/chroma) and [github.com/go-pkgz/auth/v2](https://github.com/go-pkgz/auth).

Updates `github.com/alecthomas/chroma/v2` from 2.23.1 to 2.24.1
- [Release notes](https://github.com/alecthomas/chroma/releases)
- [Commits](https://github.com/alecthomas/chroma/compare/v2.23.1...v2.24.1)

Updates `github.com/go-pkgz/auth/v2` from 2.1.2-0.20260421203319-686683f19cf7 to 2.1.2
- [Release notes](https://github.com/go-pkgz/auth/releases)
- [Commits](https://github.com/go-pkgz/auth/commits/v2.1.2)

---
updated-dependencies:
- dependency-name: github.com/alecthomas/chroma/v2
  dependency-version: 2.24.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: go-modules-updates
- dependency-name: github.com/go-pkgz/auth/v2
  dependency-version: 2.1.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: go-modules-updates
...

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

backend/_example/memory_store/go.mod

@@ -13,11 +13,11 @@ require (
 require (
 	github.com/Depado/bfchroma/v2 v2.0.0 // indirect
 	github.com/PuerkitoBio/goquery v1.12.0 // indirect
-	github.com/alecthomas/chroma/v2 v2.23.1 // indirect
+	github.com/alecthomas/chroma/v2 v2.24.1 // indirect
 	github.com/andybalholm/cascadia v1.3.3 // indirect
 	github.com/aymerick/douceur v0.2.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/dlclark/regexp2 v1.11.5 // indirect
+	github.com/dlclark/regexp2 v1.12.0 // indirect
 	github.com/go-pkgz/rest v1.21.0 // indirect
 	github.com/go-pkgz/routegroup v1.6.0 // indirect
 	github.com/gorilla/css v1.0.1 // indirect