fix: import handlebars instead of runtime

[mrlubos]

Closes https://github.com/hey-api/openapi-ts/issues/1082

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Latest commit: b528236b626d12d4ac03b98b8abecc425291c5e5

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.79%. Comparing base (b53de31) to head (b528236). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1087 +/- ## ======================================= Coverage 81.79% 81.79% ======================================= Files 102 102 Lines 11421 11421 Branches 1231 1230 -1 ======================================= Hits 9342 9342 Misses 2076 2076 Partials 3 3 ``` | [Flag](https://app.codecov.io/gh/hey-api/openapi-ts/pull/1087/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hey-api) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/hey-api/openapi-ts/pull/1087/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hey-api) | `81.79% <100.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hey-api#carryforward-flags-in-the-pull-request-comment) to find out more.

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commit: b528236