cmScanDepFormat: Accept P1689r4 files with version 1
VS 2022's `cl` 19.30 has a `-scanDependencies` option that produces the P1689r4 format. It reports the "version" field with value "1".
VS 2022's `cl` 19.30 has a `-scanDependencies` option that produces the P1689r4 format. It reports the "version" field with value "1".