Bump php-actions/composer from 5 to 6

[dependabot]

Bumps php-actions/composer from 5 to 6.

Release notes

Sourced from php-actions/composer's releases.

June 2021 release

• php-build has been updated to allow different versions of Composer/PHP to be built separately, meaning faster builds for your projects.
• The host environment variables within Github Actions are passed to the Docker container. This Action runs as a Composite Runner, so the actual tests are ran within a custom Docker image, supplied by php-build.
• Composer's memory limit can be adjusted now thanks to the memory_limit input added by @​TimWerdin.
• When a build fails, all debug output is shown within the action's output, but is grouped within a "debug output" summary. This means that whether your build passes or fails, you'll still see the Composer output in the format you'd expect, but you are now only one click away from viewing all the commands Github Actions ran to get the build running, in case there is a configuration issue to debug. This is shown as the last line of the output, as a clickable summary group that expands to show the full detail.
• Docs updated, thanks to @​binarygary, @​LorenzoSapora and @​vlasscontreras!

From now on, minor version releases will be made using semantic versioning, with the major version being retagged on the non-specific version tag. For example, the release of v3.0.0 will be tagged as both v3.0.0 and v3 - when a minor version is released, a new tag of v3.1.0 will be created, and the v3 tag will be retagged to point to the latest release within the major release of 3.x. This gives developers the choice of whether to keep up to date with all v3 developments, or fix their builds to a specific version of this action.

As always, have fun and stay productive!

If you've found this action helpful, please consider sponsoring the developer.

v6.0.0

Semantic version release for v6 tag. Please see https://github.com/php-actions/composer/releases/tag/v6 for the full release notes.

Commits

• d936bcb Merge branch '40-env'
• c115e89 docs: update readme for v6
• 000a9d1 set full_command output variable before running
• 3dfa462 expose network from host to runner
• 8a7a9be group debug output on failure
• ddf3c64 wip: quiet skipping
• 2ff57fc wip: pass actual docker env file to docker
• 64eacb1 debug: reverse logic
• 6592425 debug: output host keys
• f477155 debug: output extracted vars
• Additional commits viewable in compare view

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