all: Update android scent level to API 24 (#12936)

Author: carl-mastrangelo

gradle/libs.versions.toml

@@ -138,7 +138,7 @@ protobuf-protoc = "com.google.protobuf:protoc:3.25.9"
 re2j = "com.google.re2j:re2j:1.8"
 robolectric = "org.robolectric:robolectric:4.16.1"
 s2a-proto = "com.google.s2a.proto.v2:s2a-proto:0.1.3"
-signature-android = "net.sf.androidscents.signature:android-api-level-21:5.0.1_r2"
+signature-android = "net.sf.androidscents.signature:android-api-level-24:7.0_r2"
 signature-java = "org.codehaus.mojo.signature:java18:1.0"
 # 11.0.0+ require Java 17+
 # checkForUpdates: tomcat-embed-core:10.+