chore(deps): update hashicorp/terraform docker tag to v0.15.5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
hashicorp/terraform	stage	patch	0.15.4 -> 0.15.5

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Release Notes

hashicorp/terraform

v0.15.5

Compare Source

0.15.5 (June 02, 2021)

BUG FIXES:

• terraform plan and terraform apply: Don't show "Objects have changed" notification when the detected changes are only internal details related to legacy SDK quirks. (#​28796)
• core: Prevent crash during planning when encountering a deposed instance that has been removed from the configuration. (#​28766)
• core: Fix crash when rendering changes to deposed instances outside of Terraform. (#​28796)
• core: Restore a missing error when attempting to import a non-existent remote object. (#​28808)
• core: Fix bug where Terraform failed to release the state lock when applying a stale saved plan failed. (#​28819)

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