fuzz: update deprecated option in Mayhemfile
diff --git a/fuzz/mayhem/packet_recv_client/Mayhemfile b/fuzz/mayhem/packet_recv_client/Mayhemfile
index d20f834..87d194e 100755
--- a/fuzz/mayhem/packet_recv_client/Mayhemfile
+++ b/fuzz/mayhem/packet_recv_client/Mayhemfile
@@ -11,5 +11,5 @@
 cmds:
   - cmd: /home/mayhem/packet_recv_client
     libfuzzer: true
-    asan: true
+    sanitizer: true
     timeout: 5
diff --git a/fuzz/mayhem/packet_recv_server/Mayhemfile b/fuzz/mayhem/packet_recv_server/Mayhemfile
index 8151077..895a5b3 100755
--- a/fuzz/mayhem/packet_recv_server/Mayhemfile
+++ b/fuzz/mayhem/packet_recv_server/Mayhemfile
@@ -11,6 +11,6 @@
 cmds:
   - cmd: /home/mayhem/packet_recv_server
     libfuzzer: true
-    asan: true
+    sanitizer: true
     timeout: 5
     env: { "QUICHE_FUZZ_CRT": "/home/mayhem/cert.crt", "QUICHE_FUZZ_KEY": "/home/mayhem/cert.key" }
diff --git a/fuzz/mayhem/qpack_decode/Mayhemfile b/fuzz/mayhem/qpack_decode/Mayhemfile
index fe41b79..83c43dd 100755
--- a/fuzz/mayhem/qpack_decode/Mayhemfile
+++ b/fuzz/mayhem/qpack_decode/Mayhemfile
@@ -11,5 +11,5 @@
 cmds:
   - cmd: /home/mayhem/qpack_decode
     libfuzzer: true
-    asan: true
+    sanitizer: true
     timeout: 5