Update dependency com.linecorp.armeria:armeria-bom to v1.26.4 (#6062)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

dependencyManagement/build.gradle.kts

@@ -11,7 +11,7 @@ val DEPENDENCY_BOMS = listOf(
   "com.fasterxml.jackson:jackson-bom:2.16.0",
   "com.google.guava:guava-bom:32.1.3-jre",
   "com.google.protobuf:protobuf-bom:3.25.1",
-  "com.linecorp.armeria:armeria-bom:1.26.3",
+  "com.linecorp.armeria:armeria-bom:1.26.4",
   "com.squareup.okhttp3:okhttp-bom:4.12.0",
   "com.squareup.okio:okio-bom:3.6.0", // applies to transitive dependencies of okhttp
   "io.grpc:grpc-bom:1.60.0",