Bump phpseclib/phpseclib to 3.0.51 and fix tests#51

mrts merged 1 commit intomainweb-eid/web-eid-authtoken-validation-php:mainfrom

WE2-430-bump-phpseclib-and-fix-testsweb-eid/web-eid-authtoken-validation-php:WE2-430-bump-phpseclib-and-fix-testsCopy head branch name to clipboard