deps: update module github.com/moby/buildkit to v0.18.1 (#800)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [github.com/moby/buildkit](https://redirect.github.com/moby/buildkit)
| `v0.18.0` -> `v0.18.1` |
[![age](https://developer.mend.io/api/mc/badges/age/go/github.com%2fmoby%2fbuildkit/v0.18.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/go/github.com%2fmoby%2fbuildkit/v0.18.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/go/github.com%2fmoby%2fbuildkit/v0.18.0/v0.18.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/go/github.com%2fmoby%2fbuildkit/v0.18.0/v0.18.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>moby/buildkit (github.com/moby/buildkit)</summary>

###
[`v0.18.1`](https://redirect.github.com/moby/buildkit/compare/v0.18.0...v0.18.1)

[Compare
Source](https://redirect.github.com/moby/buildkit/compare/v0.18.0...v0.18.1)

</details>

---

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---

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---

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go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/grpc-ecosystem/go-grpc-middleware/providers/prometheus v1.0.1
 	github.com/hetznercloud/hcloud-go/v2 v2.17.0
 	github.com/kubernetes-csi/csi-test/v5 v5.3.1
-	github.com/moby/buildkit v0.18.0
+	github.com/moby/buildkit v0.18.1
 	github.com/prometheus/client_golang v1.20.5
 	github.com/stretchr/testify v1.10.0
 	golang.org/x/sys v0.27.0

go.sum

@@ -63,6 +63,8 @@ github.com/moby/buildkit v0.17.2 h1:/jgk/MuXbA7jeXMkknOpHYB+Ct4aNvQHkBB7SxD3D4U=
 github.com/moby/buildkit v0.17.2/go.mod h1:vr5vltV8wt4F2jThbNOChfbAklJ0DOW11w36v210hOg=
 github.com/moby/buildkit v0.18.0 h1:KSelhNINJcNA3FCWBbGCytvicjP+kjU5kZlZhkTUkVo=
 github.com/moby/buildkit v0.18.0/go.mod h1:vCR5CX8NGsPTthTg681+9kdmfvkvqJBXEv71GZe5msU=
+github.com/moby/buildkit v0.18.1 h1:Iwrz2F/Za2Gjkpwu3aM2LX92AFfJCJe2oNnvGNvh2Rc=
+github.com/moby/buildkit v0.18.1/go.mod h1:vCR5CX8NGsPTthTg681+9kdmfvkvqJBXEv71GZe5msU=
 github.com/moby/sys/mountinfo v0.7.2 h1:1shs6aH5s4o5H2zQLn796ADW1wMrIwHsyJ2v9KouLrg=
 github.com/moby/sys/mountinfo v0.7.2/go.mod h1:1YOa8w8Ih7uW0wALDUgT1dTTSBrZ+HiBLGws92L2RU4=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=