fix(deps): update dependency com.google.guava:guava-bom to v33.4.8-jre (#1850)

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

Author: renovate[bot]

buildSrc/src/main/kotlin/otel.java-conventions.gradle.kts

@@ -137,7 +137,7 @@ testing {
 
       implementation(enforcedPlatform("org.junit:junit-bom:5.12.2"))
       implementation(enforcedPlatform("org.testcontainers:testcontainers-bom:1.20.6"))
-      implementation(enforcedPlatform("com.google.guava:guava-bom:33.4.7-jre"))
+      implementation(enforcedPlatform("com.google.guava:guava-bom:33.4.8-jre"))
       implementation(enforcedPlatform("com.linecorp.armeria:armeria-bom:1.32.4"))
 
       compileOnly("com.google.auto.value:auto-value-annotations")