Update Helm release prl-cron to v0.0.18 in prl-cron-hearing-actual-task

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
prl-cron	patch	0.0.17 -> 0.0.18

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Release Notes

hmcts/prl-cron (prl-cron)

v0.0.18: Fix to secret key-value pair issue

Compare Source

Fix to secret key-value pair issue

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