chore(deps): bump stripe/stripe-php from 15.7.0 to 17.6.0

Bumps [stripe/stripe-php](https://github.com/stripe/stripe-php) from 15.7.0 to 17.6.0.
- [Release notes](https://github.com/stripe/stripe-php/releases)
- [Changelog](https://github.com/stripe/stripe-php/blob/master/CHANGELOG.md)
- [Commits](stripe/stripe-php@v15.7.0...v17.6.0)

---
updated-dependencies:
- dependency-name: stripe/stripe-php
  dependency-version: 17.6.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

composer.json

@@ -77,7 +77,7 @@
 		"tubalmartin/cssmin": "^4.1",
 		"wptt/webfont-loader": "^1.1",
 		"sabberworm/php-css-parser": "^8.4",
-		"stripe/stripe-php": "^15.3",
+		"stripe/stripe-php": "^17.6",
 		"enshrined/svg-sanitize": "^0.21.0"
 	}
 }