Minor fix to address ambiguity in error message.

[spapi17]

Release Note Template for Downstream PRs (will be copied)

composer: fixed validation on `google_composer_environment` resource so it will identify a disallowed upgrade to Composer 3 before attempting to provide feedback that's specific to using Composer 3

[github-actions]

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@SarahFrench, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

You can help make sure that review is quick by doing a self-review and by running impacted tests locally.

[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.

google-beta provider: Diff ( 1 file changed, 4 insertions(+), 2 deletions(-))

[modular-magician]

Tests analytics

Total tests: 42
Passed tests: 42
Skipped tests: 0
Affected tests: 0

Click here to see the affected service packages

• composer

$\textcolor{green}{\textsf{All tests passed!}}$
View the build log

[spapi17]

Hi @SarahFrench, could you please take a look?