Bump github.com/cloudevents/sdk-go/v2 in /script/validator

Bumps [github.com/cloudevents/sdk-go/v2](https://github.com/cloudevents/sdk-go) from 2.13.0 to 2.15.2.
- [Release notes](https://github.com/cloudevents/sdk-go/releases)
- [Commits](cloudevents/sdk-go@v2.13.0...v2.15.2)

---
updated-dependencies:
- dependency-name: github.com/cloudevents/sdk-go/v2
  dependency-type: indirect
...

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

script/validator/go.mod

@@ -21,7 +21,7 @@ require (
 	github.com/census-instrumentation/opencensus-proto v0.4.1 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/cloudevents/sdk-go/sql/v2 v2.13.0 // indirect
-	github.com/cloudevents/sdk-go/v2 v2.13.0 // indirect
+	github.com/cloudevents/sdk-go/v2 v2.15.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/emicklei/go-restful/v3 v3.9.0 // indirect
 	github.com/evanphx/json-patch v5.6.0+incompatible // indirect

script/validator/go.sum

@@ -113,8 +113,8 @@ github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMn
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cloudevents/sdk-go/sql/v2 v2.13.0 h1:gMJvQ3XFkygY9JmrusgK80d9yRAb8+J3X8IA1OC+oc0=
 github.com/cloudevents/sdk-go/sql/v2 v2.13.0/go.mod h1:XZRQBCgRreddIpQrdjBJQUrRg3BCs3aikplJQkHrK44=
-github.com/cloudevents/sdk-go/v2 v2.13.0 h1:2zxDS8RyY1/wVPULGGbdgniGXSzLaRJVl136fLXGsYw=
-github.com/cloudevents/sdk-go/v2 v2.13.0/go.mod h1:xDmKfzNjM8gBvjaF8ijFjM1VYOVUEeUfapHMUX1T5To=
+github.com/cloudevents/sdk-go/v2 v2.15.2 h1:54+I5xQEnI73RBhWHxbI1XJcqOFOVJN85vb41+8mHUc=
+github.com/cloudevents/sdk-go/v2 v2.15.2/go.mod h1:lL7kSWAE/V8VI4Wh0jbL2v/jvqsm6tjmaQBSvxcv4uE=
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
 github.com/cncf/udpa/go v0.0.0-20200629203442-efcf912fb354/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
 github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=