lighttpd: update to 1.4.73.

>From the changelog:

* [core] add .mkv to mimetype.assign builtin defaults
* [core] warn if out-of-range value for config short
* [mod_openssl] set default curves for ossl < 1.1.0
* [mod_h2] parse HEADERS flags sooner
* [mod_h2] check send window before defer frame rd
* [mod_h2] send GOAWAY to excessive request flood
* [mod_h2] h2_parse_headers_frame() adjust args
* [mod_h2] h2_recv_headers() parse trailers earlier
* [mod_h2] discard new streams after GOAWAY sent
* [mod_h2] h2_discard_headers() to HPACK-decode hdrs
* [core] parse entire server.http-parseopts list
* [mod_wstunnel] Sec-WebSocket-Protocol only if req hdr
* [mod_h2] disable h2proto if mod_h2 was not found
* [core] omit dlopen trace for mod_h2, mod_deflate
* [mod_h2] defer input parsing if large output queue
* [mod_h2] defer frame handling if stream pend close
* [mod_h2] detect and log HTTP/2 rapid reset attack
* [core] honor MBEDTLS_USE_PSA_CRYPTO for hash,rand
* [mod_mbedtls] honor MBEDTLS_USE_PSA_CRYPTO for rand
* [core] comment out li_rand_bytes() (unused)
* [mod_mbedtls] handle mbedtls 3.x partial write
* [mod_openssl] warn if openssl version < 3.0.0
* [mod_openssl] include openssl/hmac.h for boringssl

(schmonz)