Bump github.com/dogmatiq/configkit from 0.13.6 to 0.13.8

Bumps [github.com/dogmatiq/configkit](https://github.com/dogmatiq/configkit) from 0.13.6 to 0.13.8.
- [Release notes](https://github.com/dogmatiq/configkit/releases)
- [Changelog](https://github.com/dogmatiq/configkit/blob/main/CHANGELOG.md)
- [Commits](dogmatiq/configkit@v0.13.6...v0.13.8)

---
updated-dependencies:
- dependency-name: github.com/dogmatiq/configkit
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

go.mod

@@ -6,7 +6,7 @@ toolchain go1.23.0
 
 require (
 	github.com/cespare/xxhash/v2 v2.3.0
-	github.com/dogmatiq/configkit v0.13.6
+	github.com/dogmatiq/configkit v0.13.8
 	github.com/dogmatiq/discoverkit v0.1.2
 	github.com/dogmatiq/dogma v0.14.2
 	github.com/dogmatiq/enginekit v0.10.3

go.sum

@@ -2,8 +2,8 @@ github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UF
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 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=
-github.com/dogmatiq/configkit v0.13.6 h1:tgMl55VC9ra1NjMfZJIyHTInTi/mTh8AScTpasIJKDs=
-github.com/dogmatiq/configkit v0.13.6/go.mod h1:wjuets0+wsD/7pYFE9bX2YvZ6LlrEx330yBG1nXoDSw=
+github.com/dogmatiq/configkit v0.13.8 h1:8VNNusYCi3AnwwQ8ZhZJLUCRJlJ5uz/yWTzXkBDE1QU=
+github.com/dogmatiq/configkit v0.13.8/go.mod h1:DKFr/17QHC0RBnzigNs0PSHf+uEPeYitDrQgy7kbcxY=
 github.com/dogmatiq/cosyne v0.2.0 h1:tO957BpS4I9kqSw31ds6Ef4CXvV8zPAqWzbXKElsGWg=
 github.com/dogmatiq/cosyne v0.2.0/go.mod h1:dD8EZjbRX7FFw9t6P7l1nwoZbA7YxtOCfl9ZZAHPucU=
 github.com/dogmatiq/dapper v0.6.0 h1:hnWUsjnt3nUiC9hmkPvuxrnMd7fYNz1i+/GS3gOx0Xs=