Disable MBEDTLS_DHM_C in component_test_tls13_only_psk

For details see the following comment: https://github.com/Mbed-TLS/mbedtls/pull/7627#issuecomment-1590792002

Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index e213442..7a32916 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -3961,6 +3961,7 @@
     scripts/config.py unset MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED
     scripts/config.py unset MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL_ENABLED
     scripts/config.py unset MBEDTLS_ECDH_C
+    scripts/config.py unset MBEDTLS_DHM_C
     scripts/config.py unset MBEDTLS_X509_CRT_PARSE_C
     scripts/config.py unset MBEDTLS_X509_RSASSA_PSS_SUPPORT
     scripts/config.py unset MBEDTLS_SSL_SERVER_NAME_INDICATION