Bump thirdparty/SingleApplication from `40601bf` to `14e9d14` #87

Job	Run time
build (windows-latest, windows, 5.12.12, 73)	3m 16s
build (ubuntu-latest, linux, 6.2.*, qtmultimedia)	1m 19s
build (ubuntu-latest, linux, 5.12.12)	1m 11s
build (macos-latest, mac, 5.15.2)	3m 17s
	9m 3s

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