Update slim/slim requirement from ^4.13 to ^4.14 #316

Job	Run time
Static Analysis	26s
Coding Standards	22s
Unit Tests (PHP 8.2) on ubuntu-latest	19s
Unit Tests (PHP 8.2) on ubuntu-latest	14s
Unit Tests (PHP 8.2) on macos-latest	1m 12s
Unit Tests (PHP 8.2) on macos-latest	1m 14s
Unit Tests (PHP 8.2) on windows-latest	51s
Unit Tests (PHP 8.2) on windows-latest	52s
Unit Tests (PHP 8.3) on ubuntu-latest	23s
Unit Tests (PHP 8.3) on ubuntu-latest	13s
Unit Tests (PHP 8.3) on macos-latest	2m 12s
Unit Tests (PHP 8.3) on macos-latest	1m 14s
Unit Tests (PHP 8.3) on windows-latest	51s
Unit Tests (PHP 8.3) on windows-latest	56s
	11m 19s

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