Release version 13
- Add v2 version for codecov action (1fcfdb6)
- socket: fix possible buffer overflow in listen_port() (9b9d149)
- socket: free socket list before exiting (5631569)
- tests: make sure on_exit handler completes (0cacc91)
- tests: fix wait_for_port() retry mechanism (5160a4a)
- use sigaction instead of signal for SIGCHLD processing (f44f4ec)
- tangd.socket: Set ownership and mode of jwkdir (ae736c9)