Bump github.com/nats-io/nats-server/v2 in the gomod group (#12) #13

Job	Run time
lint	48s
changed-services	13s
test	40s
vulncheck (subtractor) / Run govulncheck	22s
vulncheck (adder) / Run govulncheck	32s
build_and_publish_images (subtractor) / build-and-push-image	1m 3s
build_and_publish_images (adder) / build-and-push-image	41s
	4m 19s

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