Compose Compiler to V1.5.6 for 1.9.21 release

Change-Id: I05c8f33664d11641dbd5f2180fae41c275189f94

diff --git a/compose/compiler/compiler-hosted/src/main/java/androidx/compose/compiler/plugins/kotlin/VersionChecker.kt b/compose/compiler/compiler-hosted/src/main/java/androidx/compose/compiler/plugins/kotlin/VersionChecker.kt
index 569b3da..9e42502 100644
--- a/compose/compiler/compiler-hosted/src/main/java/androidx/compose/compiler/plugins/kotlin/VersionChecker.kt
+++ b/compose/compiler/compiler-hosted/src/main/java/androidx/compose/compiler/plugins/kotlin/VersionChecker.kt

@@ -142,7 +142,7 @@
          * The maven version string of this compiler. This string should be updated before/after every
          * release.
          */
-        const val compilerVersion: String = "1.5.5"
+        const val compilerVersion: String = "1.5.6"
         private val minimumRuntimeVersion: String
             get() = runtimeVersionToMavenVersionTable[minimumRuntimeVersionInt] ?: "unknown"
     }

diff --git a/libraryversions.toml b/libraryversions.toml
index d65da74..3c17490 100644
--- a/libraryversions.toml
+++ b/libraryversions.toml

@@ -21,7 +21,7 @@
 CAR_APP = "1.7.0-alpha01"
 COLLECTION = "1.4.0-beta02"
 COMPOSE = "1.7.0-alpha01"
-COMPOSE_COMPILER = "1.5.5"
+COMPOSE_COMPILER = "1.5.6"
 COMPOSE_MATERIAL3 = "1.2.0-beta01"
 COMPOSE_MATERIAL3_ADAPTIVE = "1.0.0-alpha02"
 COMPOSE_MATERIAL3_ADAPTIVE_NAVIGATION_SUITE = "1.0.0-alpha01"