Update slim/slim requirement from ^4.13 to ^4.14 #308

Job	Run time
Coding Standards	21s
Static Analysis	23s
Unit Tests (PHP 8.2) on ubuntu-latest	15s
Unit Tests (PHP 8.2) on ubuntu-latest	20s
Unit Tests (PHP 8.2) on macos-latest	1m 20s
Unit Tests (PHP 8.2) on macos-latest	1m 21s
Unit Tests (PHP 8.2) on windows-latest	43s
Unit Tests (PHP 8.2) on windows-latest	1m 0s
Unit Tests (PHP 8.3) on ubuntu-latest	16s
Unit Tests (PHP 8.3) on ubuntu-latest	16s
Unit Tests (PHP 8.3) on macos-latest	1m 31s
Unit Tests (PHP 8.3) on macos-latest	1m 13s
Unit Tests (PHP 8.3) on windows-latest	41s
Unit Tests (PHP 8.3) on windows-latest	40s
	10m 20s

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