fix: update @aws-cdk/aws-service-spec dev dependency (#1728)

## Issue

The release workflow is blocked
(https://github.com/cdklabs/awscdk-service-spec/actions/runs/13987488911)
due to a recent change in the
[cdklabs/cdklabs-projen-project-types](https://github.com/cdklabs/cdklabs-projen-project-types/tree/main)
dependency ([PR
#832](cdklabs/cdklabs-projen-project-types#832)).

## Change

Set the devDependency `@aws-cdk/service-spec-importers` of
`@aws-cdk/aws-service-spec` to the exact version `0.0.0`, as it is a
sibling module within the same monorepo.

Author: 5d