2.3.0

• Add support for Ubuntu 20.04 runners. Refer to the docs.
• Add support to specify composer version in tools input. Refer to the docs.
• Update actions/cache uses to v2.
• Pre-install PCOV on PHP 8.
• Switch from xz to zstd compression for packaging PHP.
• Decouple scripts for PHP 5.5 and lower on Linux and macOS.
• Decouple script for PHP 8.0 on Linux.
• Fix intermittent peer fingerprint error on PHP 5.5 and lower.
• Fix blackfire setup.
• Fix updating powershell profiles on Windows.
• Fix fetching CA bundle in Windows self-hosted runners.
• Fix setrlimit warning with sudo in Ubuntu 20.04 self-hosted runners.
• Fix PhpManager setup on windows for self-hosted runners.
• Fix tools setup on windows for self-hosted runners.
• Fix updating lists on Ubuntu 16.04 after adding ppa:ondrej/php on self-hosted runners.
• Fix logs for unsupported PHP versions on self-hosted runners.
• Improve documentation and templates.
• Refactor internal testing workflows.
• Revert to ES2019 as Node 12.x is the default version.
• Cleanup ESlint config.
• Update Node dependencies.