fix: Error: R] [unreachable] Not an ESM module. [plugin deno-loader] with config vendor: true

[iugo]

The code is throwing an error Error: R] [unreachable] Not an ESM module. [plugin deno-loader] when run on a new PC and in CI. More details can be found in the CI info here: https://github.com/iugo/deno-fresh-test/actions/runs/10051684696/job/27781680895

This is a strange issue because the same Deno version is working fine on my other machines.

The repository where this issue can be reproduced is: https://github.com/iugo/deno-fresh-test/tree/9ebbbbd4e99164234ae96d50e13d03ca7ea7f32e

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The issue was found to be incompatible with the vendor: true configuration in deno.json. The problem can be resolved after this commit.