upgrade alpine base image from v3.18.5 to v3.19.0 including upgrade of postfix package from v3.8.3-r0 to v3.8.3-r1 (rebuild against icu 74.1)
https://git.alpinelinux.org/aports/commit/main/postfix?h=3.19-stable&id=f38cdc3c34da1e1ebaa4783b61443fbb353d8d21