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Drop support for Swift < 5.9 (#39) #3

Job	Run time
Unit Tests / Windows (6.0)	2s
Unit Tests / Windows (nightly-6.0)	1s
Unit Tests / Linux (5.9)	3m 23s
Unit Tests / Linux (5.10)	3m 22s
Unit Tests / Windows (nightly-main)	3s
Unit Tests / Linux (6.0)	3m 42s
Unit Tests / Linux (nightly-6.0)	4m 23s
Unit Tests / Linux (nightly-main)	4m 24s
Cxx interop / Cxx interop / Windows (6.0)	2s
Cxx interop / Cxx interop / Windows (nightly-6.0)	3s
Cxx interop / Cxx interop / Linux (5.9)	2m 42s
Cxx interop / Cxx interop / Windows (nightly-main)	3s
Cxx interop / Cxx interop / Linux (5.10)	2m 42s
Cxx interop / Cxx interop / Linux (6.0)	2m 54s
Cxx interop / Cxx interop / Linux (nightly-6.0)	3m 39s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 52s
	35m 17s

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