pmaports.cfg: bump min pmb version to 1.41.0 (MR 2890)

Require a version of pmbootstrap that supports conflicting dependencies,
for the upcoming patch that adds !pipewire-pulse as dependency to
postmarketos-ui-phosh.

Related: pmbootstrap MRs 2146, 2157

pmaports.cfg

 # Reference: https://postmarketos.org/pmaports.cfg
 [pmaports]
 version=7
-pmbootstrap_min_version=1.37.0
+pmbootstrap_min_version=1.41.0
 channel=edge
 supported_root_filesystems=btrfs,ext4,f2fs
 supported_firewall=nftables