Prepare 1.17.3 release metadata and changelog

[Copilot]

This prepares a new release version following the composer release flow and ensures the new tag has matching changelog and metadata for the latest Symfony 8 support update.

• Release metadata
  • Bump version to 1.17.3 in composer.json and CLI application version.
  • Refresh README version badge to keep public metadata consistent.
• Changelog entry
  • Add the 1.17.3 release section with compare link and Symfony 8 support note.

Example (CHANGELOG entry format):

## [1.17.3](https://github.com/marcocesarato/php-conventional-changelog/compare/v1.17.2...v1.17.3) (2026-01-21)

### Features

* Add support for Symfony 8 (...)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/php-fig/container/zipball/c71ecc56dfe541dbd90c5360474fbc405f8d5963
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/zA4h4s /usr/bin/composer install (http block)
• https://api.github.com/repos/symfony/polyfill-ctype/zipball/5bbc823adecdae860bb64756d639ecfec17b050a
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/zA4h4s /usr/bin/composer install (http block)
• https://api.github.com/repos/symfony/polyfill-intl-grapheme/zipball/511a08c03c1960e08a883f4cffcacd219b758354
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/zA4h4s /usr/bin/composer install (http block)
• https://api.github.com/repos/symfony/polyfill-intl-normalizer/zipball/19bd1e4fcd5b91116f14d8533c57831ed00571b6
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/zA4h4s /usr/bin/composer install (http block)
• https://api.github.com/repos/symfony/polyfill-mbstring/zipball/8ad114f6b39e2c98a8b0e3bd907732c207c2b534
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/zA4h4s /usr/bin/composer install (http block)
• https://api.github.com/repos/symfony/polyfill-php80/zipball/7a6ff3f1959bb01aefccb463a0f2cd3d3d2fd936
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/zA4h4s /usr/bin/composer install (http block)
• https://api.github.com/repos/symfony/service-contracts/zipball/a8c9cedf55f314f3a186041d19537303766df09a
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/zA4h4s /usr/bin/composer install (http block)
• https://api.github.com/repos/symfony/string/zipball/823f143370880efcbdfa2dbca946b3358c4707e5
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/zA4h4s /usr/bin/composer install (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Create a new version with latest changes following composer folow

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[Copilot]

Pull request overview

This PR prepares the release of version 1.17.3, updating all version metadata and documenting the Symfony 8 support feature that was added in a previous commit.

Changes:

• Bump version from 1.17.2 to 1.17.3 across all relevant files
• Add CHANGELOG.md entry for version 1.17.3 documenting Symfony 8 support
• Update README.md version badge to reflect the new version

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
conventional-changelog	Updates CLI application version string to 1.17.3
composer.json	Updates package version metadata to 1.17.3
README.md	Updates version badge from 1.17.2 to 1.17.3
CHANGELOG.md	Adds release entry for 1.17.3 with Symfony 8 support feature note

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