Bump com.approvaltests:approvaltests from 26.1.0 to 26.6.1 (#315)

Bumps [com.approvaltests:approvaltests](https://github.com/approvals/ApprovalTests.Java) from 26.1.0 to 26.6.1.
- [Release notes](https://github.com/approvals/ApprovalTests.Java/releases)
- [Changelog](https://github.com/approvals/ApprovalTests.Java/blob/master/internal_documentation/release.md)
- [Commits](approvals/ApprovalTests.Java@26.1.0...26.6.1)

---
updated-dependencies:
- dependency-name: com.approvaltests:approvaltests
  dependency-version: 26.6.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

build.gradle

@@ -24,7 +24,7 @@ dependencies {
     testImplementation platform("org.junit:junit-bom:5.11.4")
     testImplementation "org.junit.jupiter:junit-jupiter"
     testImplementation "org.assertj:assertj-core:3.27.4"
-    testImplementation "com.approvaltests:approvaltests:26.1.0"
+    testImplementation "com.approvaltests:approvaltests:26.6.1"
 
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 }