If curl fails to lớn connect as well it's definitely not a Composer issue, but must be something in your environment/network.
It seems the TLS handshake fails entirely, so sánh I guess it's a network problem.
FYI I get this output from openssl:
$ openssl s_client -connect :443 -servername
CONNECTED(00000003)
depth=2 C = US, O = DigiCert Inc, OU = www.digicert.com, công nhân = DigiCert Global Root CA
verify return:1
depth=1 C = US, O = DigiCert Inc, công nhân = DigiCert TLS Hybrid ECC SHA384 2020 CA1
verify return:1
depth=0 C = US, ST = California, L = San Francisco, O = "GitHub, Inc.", công nhân =
verify return:1
---
Certificate chain
0 s:C = US, ST = California, L = San Francisco, O = "GitHub, Inc.", công nhân =
i:C = US, O = DigiCert Inc, công nhân = DigiCert TLS Hybrid ECC SHA384 2020 CA1
a:PKEY: id-ecPublicKey, 256 (bit); sigalg: ecdsa-with-SHA384
v:NotBefore: Mar 15 00:00:00 2022 GMT; NotAfter: Mar 15 23:59:59 2023 GMT
1 s:C = US, O = DigiCert Inc, công nhân = DigiCert TLS Hybrid ECC SHA384 2020 CA1
i:C = US, O = DigiCert Inc, OU = www.digicert.com, công nhân = DigiCert Global Root CA
a:PKEY: id-ecPublicKey, 384 (bit); sigalg: RSA-SHA384
v:NotBefore: Apr 14 00:00:00 2021 GMT; NotAfter: Apr 13 23:59:59 2031 GMT
---