Pin API Fuzzing CI template to v1

What does this MR do?

Pin the latest API Fuzzing CI template to major version 1.

Related to #327743 (closed)

CI Template

• Change is backwards compatible, but only being made to latest template
• No tests have been added/changed as CI template logic has stayed the same
• Test Project:
  • Project
  • CI Template
  • Job
  • 

Screenshots (strongly suggested)

No screenshot provided, the latest version CI templates are not displayed in the UX.

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • I have included a changelog entry.
  • I have not included a changelog entry because _____.
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

• [-] Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• [-] Label as security and @ mention @gitlab-com/gl-security/appsec
• [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [-] Security reports checked/validated by a reviewer from the AppSec team