Add pi5 to pi version enum #304

Job	Run time
Gradle Build	4m 34s
Build Examples	3m 33s
Build Offline Docs	42s
PhotonClient Build	41s
Photonlib - Build Docker - Athena	6m 7s
Photonlib - Build Host - Win64	4m 40s
Photonlib - Build Docker - Raspbian	6m 24s
Photonlib - Build Host - macOS	5m 42s
Photonlib - Build Docker - Aarch64	6m 55s
Photonlib - Build Host - Linux	3m 53s
Build fat JAR - Win64	2m 44s
Build fat JAR - macOS	4m 54s
Build fat JAR - Linux	1m 40s
Build fat JAR - macOSArm	2m 38s
Build fat JAR - LinuxArm32	2m 12s
Build fat JAR - LinuxArm64	1m 31s
Build image - ${{ matrix.image_url }}	0s
release	0s
	58m 50s

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