## Summary

Picks up [wp-php-toolkit
v0.7.3](https://github.com/WordPress/php-toolkit/releases/tag/v0.7.3),
which fixed the published-package autoload regressions caught by
WordPress/php-toolkit#264. The most relevant fixes for reprint:

- data-liberation@0.7.3 now correctly declares its dependency on
wp-php-toolkit/html
- polyfill@0.7.3 no longer eagerly declares WP_Error through
autoload.files
- Various optional integrations bundled in vendored Symfony / webuni
packages are excluded from the classmap

## Changes

- packages/reprint-exporter/composer.json: ^0.7.2 -> ^0.7.3 for
data-liberation and html
- packages/reprint-importer/composer.json: same
- composer.lock refreshed; all transitive toolkit packages resolve to
v0.7.3

## Test plan

- [x] composer update wp-php-toolkit/data-liberation wp-php-toolkit/html
resolves cleanly to v0.7.3 across all transitive packages
- [x] composer compat (PHP 7.4 compatibility) passes
- [x] ExportLibraryLoadTest and BuildPdoDsnTest pass locally
- [ ] PHPUnit matrix green on CI