upgrade esbuild to 0.11.6

[Adjective-Object]

Upgrading esbuild to ^0.11.6 to capture the fix for evanw/esbuild#1198

[Adjective-Object]

@privatenumber I think there may be an issue with the PR build. These runs are failing with missing type errors, which I don't think would be triggered by an esbuild upgrade.

...
Error: src/loader.ts(1,16): error TS2307: Cannot find module 'fs' or its corresponding type declarations.
Error: src/loader.ts(2,18): error TS2307: Cannot find module 'path' or its corresponding type declarations.
Error: src/loader.ts(3,52): error TS2307: Cannot find module 'esbuild' or its corresponding type declarations.
Error: src/loader.ts(4,26): error TS2307: Cannot find module 'loader-utils' or its corresponding type declarations.
Error: src/loader.ts(5,21): error TS2307: Cannot find module 'webpack' or its corresponding type declarations.
...

[privatenumber]

Closing this in favor of #164 which updates to the latest 0.11.18

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The reason why tests failed is because the lock file was not updated. The tests weren't updated so that would've failed too.

And FYI, the evanw/esbuild#1198 fix was released in v0.11.16 so this update wouldn't include that.