Prepare release v1.0.3 (#203)

## heroku/php

### Added

- PHP/8.3.21
- PHP/8.4.7
- ext-phalcon/5.9.3
- ext-grpc/1.72.0
- ext-uuid/1.3.0
- librdkafka/2.10.0
- Nginx/1.28.0
- Composer/2.8.9

### Fixed

- Nginx fails to start ([#186](#186))

Co-authored-by: heroku-linguist[bot] <136119646+heroku-linguist[bot]@users.noreply.github.com>

Author: heroku-linguist[bot]

buildpacks/php/CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.0.3] - 2025-05-15
+
 ### Added
 
 - PHP/8.3.21
@@ -100,7 +102,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial implementation
 
-[unreleased]: https://github.com/heroku/buildpacks-php/compare/v1.0.2...HEAD
+[unreleased]: https://github.com/heroku/buildpacks-php/compare/v1.0.3...HEAD
+[1.0.3]: https://github.com/heroku/buildpacks-php/compare/v1.0.2...v1.0.3
 [1.0.2]: https://github.com/heroku/buildpacks-php/compare/v1.0.1...v1.0.2
 [1.0.1]: https://github.com/heroku/buildpacks-php/compare/v1.0.0...v1.0.1
 [1.0.0]: https://github.com/heroku/buildpacks-php/compare/v0.2.4...v1.0.0

buildpacks/php/buildpack.toml

@@ -2,7 +2,7 @@ api = "0.10"
 
 [buildpack]
 id = "heroku/php"
-version = "1.0.2"
+version = "1.0.3"
 name = "Heroku PHP"
 homepage = "https://github.com/heroku/buildpacks-php"
 description = "Heroku's buildpack for PHP applications."