chore: Bump github.com/pb33f/libopenapi from 0.27.2 to 0.28.0

Bumps [github.com/pb33f/libopenapi](https://github.com/pb33f/libopenapi) from 0.27.2 to 0.28.0.
- [Release notes](https://github.com/pb33f/libopenapi/releases)
- [Commits](pb33f/libopenapi@v0.27.2...v0.28.0)

---
updated-dependencies:
- dependency-name: github.com/pb33f/libopenapi
  dependency-version: 0.28.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

go.mod

@@ -25,7 +25,7 @@ require (
 	github.com/jarcoal/httpmock v1.4.1
 	github.com/mongodb-forks/digest v1.1.0
 	github.com/mongodb/atlas-sdk-go v1.0.1-0.20250915083841-6f42ac117506
-	github.com/pb33f/libopenapi v0.27.2
+	github.com/pb33f/libopenapi v0.28.0
 	github.com/sebdah/goldie/v2 v2.7.1
 	github.com/spf13/cast v1.10.0
 	github.com/stretchr/testify v1.11.1

go.sum

@@ -1217,8 +1217,8 @@ github.com/openlyinc/pointy v1.1.2 h1:LywVV2BWC5Sp5v7FoP4bUD+2Yn5k0VNeRbU5vq9jUM
 github.com/openlyinc/pointy v1.1.2/go.mod h1:w2Sytx+0FVuMKn37xpXIAyBNhFNBIJGR/v2m7ik1WtM=
 github.com/pb33f/jsonpath v0.1.2 h1:PlqXjEyecMqoYJupLxYeClCGWEpAFnh4pmzgspbXDPI=
 github.com/pb33f/jsonpath v0.1.2/go.mod h1:TtKnUnfqZm48q7a56DxB3WtL3ipkVtukMKGKxaR/uXU=
-github.com/pb33f/libopenapi v0.27.2 h1:buDwqA6SKWwrG4YZwJprBV+bk8uizqLgiF4lkIV9w14=
-github.com/pb33f/libopenapi v0.27.2/go.mod h1:mHMHA3ZKSZDTInNAuUtqkHlKLIjPm2HN1vgsGR57afc=
+github.com/pb33f/libopenapi v0.28.0 h1:j8o3Tttxo1AvX/QknIVXvmF1ixiR8Bl93FOgB+OQPt0=
+github.com/pb33f/libopenapi v0.28.0/go.mod h1:mHMHA3ZKSZDTInNAuUtqkHlKLIjPm2HN1vgsGR57afc=
 github.com/pb33f/ordered-map/v2 v2.3.0 h1:k2OhVEQkhTCQMhAicQ3Z6iInzoZNQ7L9MVomwKBZ5WQ=
 github.com/pb33f/ordered-map/v2 v2.3.0/go.mod h1:oe5ue+6ZNhy7QN9cPZvPA23Hx0vMHnNVeMg4fGdCANw=
 github.com/phpdave11/gofpdf v1.4.2/go.mod h1:zpO6xFn9yxo3YLyMvW8HcKWVdbNqgIfOOp2dXMnm1mY=