Merge branch 'bugfix/client_only_mbedtls' into 'master'

mbedtls: fix build fail with client only mbedtls

Closes IDFGH-5842

See merge request espressif/esp-idf!15286

components/coap/libcoap

@@ -1 +1 @@
-Subproject commit 9b6451c3654bc1f625e36c87f018c2da34bea5e6
+Subproject commit 3aa11612c143c9734d72022720f33e12506f7a2c

tools/test_apps/system/build_test/sdkconfig.ci.client_only_mbedtls

@@ -0,0 +1 @@
+CONFIG_MBEDTLS_TLS_CLIENT_ONLY=y