fix: missing enum variant for StakingOperation. #1606

Job	Run time
changes	5s
license / License checks	9s
contracts-prettier	0s
ipld-resolver / Pre-compile checks	15s
ipc / Pre-compile checks	11s
fendermint-test / Pre-compile checks	20s
contracts-deployment-test	0s
contracts-test	0s
fevm-contract-tests / run	2m 59s
contracts-npm-audit	0s
contracts-sast	0s
contracts-storage	0s
extras	0s
ipc / Clippy (ubuntu-latest, stable)	3m 8s
ipc / Test (ubuntu-latest, stable)	3m 30s
ipld-resolver / Check clippy (ubuntu-latest, stable)	1m 58s
ipld-resolver / Test (ubuntu-latest, stable)	2m 25s
fendermint-test / Clippy (ubuntu-latest, stable)	10m 20s
fendermint-test / Build and Test (ubuntu-latest, stable)	18m 8s
fendermint-test / End-to-End (ubuntu-latest, stable)	49m 26s
fendermint-publish	0s
	1h 32m 54s

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