fix bug when setting `use_ibm_owned_encryption_key` to true in the DA

[ocofaigh]

Description

• fix bug when setting use_ibm_owned_encryption_key to true in the DA
• fixed the use_ibm_owned_encryption_key so its a boolean (was incorrectly set as string)

Release required?

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• [ ] Patch release (x.x.X)
• [ ] Minor release (x.X.x)
• [ ] Major release (X.x.x)

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[ocofaigh]

/run pipeline

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/run pipeline

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/run pipeline

[terraform-ibm-modules-ops]

:tada: This PR is included in version 3.19.3 :tada:

The release is available on:

• GitHub release
• v3.19.3

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