fix typo in upgrading

[ukclivecox]

No description provided.

[seldondev]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[seldondev]

@cliveseldon: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
lint	07ebc6f	link	/test lint
pr-build	07ebc6f	link	/test this

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