extend cache interface with throwable for v1.x.x

[Zrnik]

Hello, can you please release this fix as 1.0.2?

This is a fix for PHP 7.4

Static analysators (PHPStan) returns error for @throws doc that Psr\SimpleCache\InvalidArgumentException is not subtype of Throwable

This issue is already fixed in v2 and v3, but they are also using union types, which breaks PHP 7.4

(unfortunately updating project to 8.0+ is not under my control)