Update next-themes version so it can use react 19 #5902

Job	Run time
build-and-check	3m 23s
test-integration-packages/internal	1m 12s
test-integration-packages/billing	1m 5s
test-integration-cli	43s
test-integration-sdk	2m 1s
test-integration-common	48s
test-integration-packages/agent-runtime	44s
test-packages/billing	47s
test-common	48s
test-packages/agent-runtime	48s
test-packages/internal	47s
test-integration-web	44s
test-.agents	1m 19s
test-cli	56s
test-sdk	46s
test-web	47s
	17m 38s

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