ちなみにopensslでtls v1.3 handshakeさせたら普通にZeroSSLの証明書返ってきたのでcURLが悪いだけっぽそう

```

$ openssl s_client -showcerts -verify 5 -connect yuuhimawari.infinityfreeapp.com:443 -tls1_3 < /dev/null

verify depth is 5

CONNECTED(00000005)

depth=0 CN = yuuhimawari.infinityfreeapp.com

verify error:num=20:unable to get local issuer certificate

verify return:1

depth=0 CN = yuuhimawari.infinityfreeapp.com

verify error:num=21:unable to verify the first certificate

verify return:1

depth=0 CN = yuuhimawari.infinityfreeapp.com

verify return:1

---

Certificate chain

0 s:CN = yuuhimawari.infinityfreeapp.com

i:C = AT, O = ZeroSSL, CN = ZeroSSL RSA Domain Secure Site CA

a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA384

v:NotBefore: Feb 21 00:00:00 2023 GMT; NotAfter: May 22 23:59:59 2023 GMT

```