upgrade postfix package from v3.6.3-r1 to 3.6.4-r0 and ca-certificates package
https://web.archive.org/web/20220123070658/http://www.postfix.org/announcements/postfix-3.6.4.html
https://git.alpinelinux.org/aports/commit/main/postfix?h=3.15-stable&id=4e030c18bb4a055e82e4954b7d0125de45d915a3
https://git.alpinelinux.org/aports/commit/main/ca-certificates?h=3.15-stable&id=709b70bcb72738cfedc510bba08141b012038167
https://github.com/fphammerle/docker-socat/commit/a0df1144f07e17ae6c7e6a707718d07967858576