Remove the need to append `/targets` to the Composer repository URL #291

Job	Run time
Generate test fixture	24s
Test on ubuntu-latest with Composer 2 and PHP 8.0	31s
Test on ubuntu-latest with Composer 2.2 and PHP 8.0	29s
Test on ubuntu-latest with Composer 2 and PHP 8.1	21s
Test on ubuntu-latest with Composer 2.2 and PHP 8.1	27s
Test on ubuntu-latest with Composer 2 and PHP 8.2	25s
Test on ubuntu-latest with Composer 2.2 and PHP 8.2	27s
Test on macos-latest with Composer 2 and PHP 8.0	57s
Test on macos-latest with Composer 2.2 and PHP 8.0	3m 2s
Test on macos-latest with Composer 2 and PHP 8.1	1m 24s
Test on macos-latest with Composer 2.2 and PHP 8.1	2m 36s
Test on macos-latest with Composer 2 and PHP 8.2	36s
Test on macos-latest with Composer 2.2 and PHP 8.2	31s
Test on windows-latest with Composer 2 and PHP 8.0	1m 28s
Test on windows-latest with Composer 2.2 and PHP 8.0	1m 22s
Test on windows-latest with Composer 2 and PHP 8.1	1m 30s
Test on windows-latest with Composer 2.2 and PHP 8.1	1m 29s
Test on windows-latest with Composer 2 and PHP 8.2	1m 21s
Test on windows-latest with Composer 2.2 and PHP 8.2	1m 30s
	20m 50s

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