fix: change crossinline to noinline for nullable lambda parameter

Kotlin does not allow crossinline parameters to be nullable. The cOp
parameter in benchTriple needs to be nullable (null when C library is
not available), so use noinline instead.

https://claude.ai/code/session_011KVZhDcV2G7idNWEBz12GY

quartz/src/jvmTest/kotlin/com/vitorpamplona/quartz/utils/secp256k1/Secp256k1TripleBenchmark.kt

@@ -84,7 +84,7 @@ class Secp256k1TripleBenchmark {
         iterations: Int,
         crossinline acinqOp: () -> Unit,
         crossinline kotlinOp: () -> Unit,
-        crossinline cOp: (() -> Unit)? = null,
+        noinline cOp: (() -> Unit)? = null,
     ): TripleResult {
         repeat(warmup) { acinqOp() }
         val acinqStart = System.nanoTime()