Update conan docs to say 12.5

Merged Steve Abrams requested to merge conan_docs_v12.5 into master

What does this MR do?

Conan did not fully make the 12.4 release, this updates the docs to reflect that it will be initially in version 12.5.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

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