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".
41 jobs for !6696 with msvc-cxx-modules-scanDependencies in 20 minutes and 32 seconds (queued for 2 seconds)
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