xmlsec: 1.2.25 -> 1.2.26

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/xmlsec/versions.

These checks were done:

- built on NixOS
- /nix/store/abvl1x7fq46597zs54989mzlbfs7fq6i-xmlsec-1.2.26/bin/.xmlsec1-wrapped passed the binary check.
- /nix/store/abvl1x7fq46597zs54989mzlbfs7fq6i-xmlsec-1.2.26/bin/xmlsec1 passed the binary check.
- 2 of 2 passed binary check by having a zero exit code.
- 0 of 2 passed binary check by having the new version present in output.
- found 1.2.26 with grep in /nix/store/abvl1x7fq46597zs54989mzlbfs7fq6i-xmlsec-1.2.26
- directory tree listing: https://gist.github.com/e9e137ae925e9687577596baffb336c3
- du listing: https://gist.github.com/dda9ad69863fe80d1ea4126315585b0c