build(deps): bump github.com/kovidgoyal/imaging from 1.8.17 to 1.8.18

Bumps [github.com/kovidgoyal/imaging](https://github.com/kovidgoyal/imaging) from 1.8.17 to 1.8.18.
- [Release notes](https://github.com/kovidgoyal/imaging/releases)
- [Commits](https://github.com/kovidgoyal/imaging/compare/v1.8.17...v1.8.18)

---
updated-dependencies:
- dependency-name: github.com/kovidgoyal/imaging
  dependency-version: 1.8.18
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

go.mod

@@ -47,7 +47,7 @@ require (
 	github.com/jellydator/ttlcache/v3 v3.4.0
 	github.com/jinzhu/now v1.1.5
 	github.com/justinas/alice v1.2.0
-	github.com/kovidgoyal/imaging v1.8.17
+	github.com/kovidgoyal/imaging v1.8.18
 	github.com/leonelquinteros/gotext v1.7.2
 	github.com/libregraph/idm v0.5.0
 	github.com/libregraph/lico v0.66.0
@@ -104,7 +104,7 @@ require (
 	go.opentelemetry.io/otel/trace v1.39.0
 	golang.org/x/crypto v0.46.0
 	golang.org/x/exp v0.0.0-20250210185358-939b2ce775ac
-	golang.org/x/image v0.33.0
+	golang.org/x/image v0.34.0
 	golang.org/x/net v0.48.0
 	golang.org/x/oauth2 v0.33.0
 	golang.org/x/sync v0.19.0