[EasyBankFiles] Fix phpstan in tests

[alexndlm]

Q	A
Bug fix?	no
New feature?	no
BC breaks?	no
Deprecations?	no
Tests pass?	yes

[eonx-space-to-github-reviews]

Code Review in Space: https://eonx.jetbrains.space/p/support/reviews/367/timeline

[roman-eonx]

👍🏆🎉

Secure code in this PR has been written to best practice standards and covers the following as a minimum. Please ticket if coded this way (also tick if not relevant to this code change):

• Protect from Injection attacks
• Protect data with proper input validation, and protect against buffer overflows, pointers/shared data
• Protect with appropriate encryption and cryptography (E.g. Appropriate hashing, symmetric encryption used, ciphers) if applicable
• Protect against XSS and CSRF
• Ensure that pages, data access etc, are written with appropriate access control authorisation and authentication requirements
• Ensure all important errors and business logic cases are handled
• Ensure forwards and redirects are handled
• Ensure no sensitive data is exposed and appropriate logging in place as required

See procedure for more details: PROC-010 Secure Coding Practices