build(deps): bump github.com/creasty/defaults

Bumps [github.com/creasty/defaults](https://github.com/creasty/defaults) from 1.5.2 to 1.8.0.
- [Release notes](https://github.com/creasty/defaults/releases)
- [Commits](creasty/defaults@v1.5.2...v1.8.0)

---
updated-dependencies:
- dependency-name: github.com/creasty/defaults
  dependency-version: 1.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

tool/actions-gh-release/go.mod

@@ -3,7 +3,7 @@ module github.com/pipe-cd/actions-gh-release
 go 1.26.2
 
 require (
-	github.com/creasty/defaults v1.5.2
+	github.com/creasty/defaults v1.8.0
 	github.com/google/go-github/v39 v39.2.0
 	github.com/stretchr/testify v1.4.0
 	golang.org/x/oauth2 v0.30.0

tool/actions-gh-release/go.sum

@@ -1,5 +1,5 @@
-github.com/creasty/defaults v1.5.2 h1:/VfB6uxpyp6h0fr7SPp7n8WJBoV8jfxQXPCnkVSjyls=
-github.com/creasty/defaults v1.5.2/go.mod h1:FPZ+Y0WNrbqOVw+c6av63eyHUAl6pMHZwqLPvXUZGfY=
+github.com/creasty/defaults v1.8.0 h1:z27FJxCAa0JKt3utc0sCImAEb+spPucmKoOdLHvHYKk=
+github.com/creasty/defaults v1.8.0/go.mod h1:iGzKe6pbEHnpMPtfDXZEr0NVxWnPTjb1bbDy08fPzYM=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=