Update symfony/polyfill-php80 requirement from ^1.28 to ^1.29

Updates the requirements on [symfony/polyfill-php80](https://github.com/symfony/polyfill-php80) to permit the latest version.
- [Commits](symfony/polyfill-php80@v1.28.0...v1.29.0)

---
updated-dependencies:
- dependency-name: symfony/polyfill-php80
  dependency-type: direct:production
...

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

composer.json

@@ -33,7 +33,7 @@
     "psr/http-factory": "^1.0",
     "psr/http-message": "^1.0 || ^2.0",
     "ralouphie/getallheaders": "^3.0",
-    "symfony/polyfill-php80": "^1.28"
+    "symfony/polyfill-php80": "^1.29"
   },
   "require-dev": {
     "ext-json": "*",