Remove v1 versions from Data API calls and insert LTS versions

[TheRealEdDawson]

Checklist

• [ ] Feature

• [ ] Bug

• [ ] ChangeLog.md updated

• [ ] Tests added

• [ ] All testsuite passes

• [ ] make dist completed successfully

[david-scarratt-lrn]

The tests use v1 as well, but maybe this should be left for Groot for a code update, rather than this doco change.