fix: set higher tls version

Author: jansimonb

tests/util/h2c_proxy.py

@@ -244,6 +244,7 @@ def _handle_connection(self, client_sock):
             # Wrap upstream with TLS if enabled
             if self.upstream_tls:
                 upstream_ssl_ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
+                upstream_ssl_ctx.minimum_version = ssl.TLSVersion.TLSv1_2
                 upstream_ssl_ctx.set_alpn_protocols(['h2'])
                 upstream_ssl_ctx.check_hostname = False
                 upstream_ssl_ctx.verify_mode = ssl.CERT_NONE