Dependabot can't resolve your PHP dependency files

[dependabot-preview]

Dependabot can't resolve your PHP dependency files.

As a result, Dependabot couldn't update your dependencies.

The error Dependabot encountered was:

Your requirements could not be resolved to an installable set of packages.
  Problem 1
    - infection/infection 0.13.4 requires php ^7.1.3 -> your PHP version (7.3.8-1+ubuntu18.04.1+deb.sury.org+1) overridden by "config.platform.php" version (7.1) does not satisfy that requirement.
    - infection/infection 0.13.3 requires php ^7.1.3 -> your PHP version (7.3.8-1+ubuntu18.04.1+deb.sury.org+1) overridden by "config.platform.php" version (7.1) does not satisfy that requirement.
    - Installation request for infection/infection ^0.13.3 -> satisfiable by infection/infection[0.13.3, 0.13.4].

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