Update humanmade/hm-redirects requirement from ~0.7.2 to ~0.7.3

Updates the requirements on [humanmade/hm-redirects](https://github.com/humanmade/hm-redirects) to permit the latest version.
- [Release notes](https://github.com/humanmade/hm-redirects/releases)
- [Changelog](https://github.com/humanmade/hm-redirects/blob/master/changelog.txt)
- [Commits](humanmade/hm-redirects@0.7.2...0.7.3)

---
updated-dependencies:
- dependency-name: humanmade/hm-redirects
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -11,7 +11,7 @@
  ],
  "require": {
  "php": ">=7.1",
- "humanmade/hm-redirects": "~0.7.2"
+ "humanmade/hm-redirects": "~0.7.3"
  },
  "autoload": {
  "files": [