Bump github.com/strukturag/libheif from 1.17.6 to 1.18.1

Bumps [github.com/strukturag/libheif](https://github.com/strukturag/libheif) from 1.17.6 to 1.18.1.
- [Release notes](https://github.com/strukturag/libheif/releases)
- [Commits](strukturag/libheif@v1.17.6...v1.18.1)

---
updated-dependencies:
- dependency-name: github.com/strukturag/libheif
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -5,7 +5,7 @@ go 1.20
 require (
 	github.com/hashicorp/go-hclog v1.6.3
 	github.com/hashicorp/go-plugin v1.6.1
-	github.com/strukturag/libheif v1.17.6
+	github.com/strukturag/libheif v1.18.1
 )
 
 require (

go.sum

@@ -35,8 +35,8 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.7.2 h1:4jaiDzPyXQvSd7D0EjG45355tLlV3VOECpq10pLC+8s=
 github.com/stretchr/testify v1.7.2/go.mod h1:R6va5+xMeoiuVRoj+gSkQ7d3FALtqAAGI1FQKckRals=
-github.com/strukturag/libheif v1.17.6 h1:UFz4FI7kKLINWyL7bcNEBu4gZxK7rHRkwq49IOzHyvE=
-github.com/strukturag/libheif v1.17.6/go.mod h1:E/PNRlmVtrtj9j2AvBZlrO4dsBDu6KfwDZn7X1Ce8Ks=
+github.com/strukturag/libheif v1.18.1 h1:Ugay4BF6EtTFu+oU04b1DhYEBiyGWwnJwWUny536X/4=
+github.com/strukturag/libheif v1.18.1/go.mod h1:E/PNRlmVtrtj9j2AvBZlrO4dsBDu6KfwDZn7X1Ce8Ks=
 golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
 golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
 golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=