Release 2.7.0 - Minor security fixes

• Tested on PHP 8.4, psalm 6 used for static analysis;
• Prevent XSS if PHP files backing networked tests (those in tests/_network directory) are served from a publicly available website.

Release 2.6.0 - tested on PHP 8.2 and 8.3

• Use psalm for static analysis, several minor issues fixed
• Correctly parse HTTP status line with an empty reason-phrase (see #26)
• Updated Public Suffix List