Update simplesamlphp to 1.14.12 regarding security fixes
Update simplesamlphp to 1.14.12 regarding security fixes

This regards [SSPSA 201703-01](https://simplesamlphp.org/security/201703-01) and [SSPSA 201703-02](https://simplesamlphp.org/security/201703-02), see https://github.com/simplesamlphp/simplesamlphp/releases/tag/v1.14.12.

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