BTN-2096: Pin tmdata version to match ska-telmodel client release
Following on from !73 (merged), which fetched a static copy of the telmodel data for unit test runs, this MR pins the version of tmdata in production/outside of test runs.
Following on from !73 (merged), which fetched a static copy of the telmodel data for unit test runs, this MR pins the version of tmdata in production/outside of test runs.