Update Helm release postgresql-ha to v14.2.18

This MR contains the following updates:

Package	Update	Change
postgresql-ha (source)	patch	14.2.16 -> 14.2.18

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Release Notes

bitnami/charts (postgresql-ha)

v14.2.18

• [bitnami/postgresql-ha] Release 14.2.18 (#​29015)

v14.2.17

• [bitnami/postgresql-ha] README tweaks (#​28820) (57ddfc5), closes #​28820
• [bitnami/postgresql-ha] Release 14.2.17 (#​28799) (59962aa), closes #​28799

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