Add missing depends_on in TestAccComputeImage_imageEncryptionKey test

[SarahFrench]

Relates to: hashicorp/terraform-provider-google#13609

Release Note Template for Downstream PRs (will be copied)

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

Terraform GA: Diff ( 1 file changed, 3 insertions(+))
Terraform Beta: Diff ( 1 file changed, 3 insertions(+))

[modular-magician]

Tests analytics

Total tests: 3300
Passed tests 2964
Skipped tests: 336
Affected tests: 0

$\textcolor{green}{\textsf{All tests passed in REPLAYING mode.}}$
View the build log

[SarahFrench]

/gcbrun

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

Terraform GA: Diff ( 1 file changed, 3 insertions(+))
Terraform Beta: Diff ( 1 file changed, 3 insertions(+))

[modular-magician]

Tests analytics

Total tests: 857
Passed tests 792
Skipped tests: 65
Affected tests: 0

Click here to see the affected service packages

• compute

$\textcolor{green}{\textsf{All tests passed in REPLAYING mode.}}$
View the build log