Update Coder to 8.3.14

Problem/Motivation

Coder 8.3.14 is released, so we should update our dependency.

Steps to reproduce

Proposed resolution

Update the dependency.
Remove the --runtime-set installed_paths switch from calls to PHPCS, as Coder now depends on dealerdirect/phpcodesniffer-composer-installer which registers sniffs automatically.

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet