fix: Encoding Firebase push notification keys #731

Job	Run time
spm-test	3m 58s
windows	2m 19s
linux	2m 15s
test (platform=iOS\ Simulator,OS=18.2,name=iPhone\ 16\ Pro\ Max, test)	5m 46s
test (platform\=tvOS\ Simulator,OS=18.2,name\=Apple\ TV, test)	4m 0s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 10\ \(42mm\), build)	1m 28s
test (platform=macOS, test)	4m 48s
test (platform=visionOS\ Simulator,OS=2.2,name=Apple\ Vision\ Pro, build)	1m 19s
cocoapods	4m 33s
xcode-test-5_7	1m 32s
docs	1m 27s
	33m 25s

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