build(deps): Bump org.testcontainers:nginx from 1.20.3 to 1.20.4

Bumps [org.testcontainers:nginx](https://github.com/testcontainers/testcontainers-java) from 1.20.3 to 1.20.4.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.3...1.20.4)

---
updated-dependencies:
- dependency-name: org.testcontainers:nginx
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle.kts

@@ -52,7 +52,7 @@ dependencies {
     testImplementation("io.kotest:kotest-assertions-core:5.9.1")
     testImplementation("com.microsoft.playwright:playwright:1.48.0")
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.11.3")
-    testImplementation("org.testcontainers:nginx:1.20.3")
+    testImplementation("org.testcontainers:nginx:1.20.4")
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.11.3")
 
     testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.11.3")