chore: always transform exponentiation

[pauldambra]

pulling small changes out of https://github.com/PostHog/posthog-js/pull/1525 because IE 11 tests are freezing in that PR and it's really hard to figure out why

We use the exponentiation operator in some code 2 ** 4 which is a relatively modern bit of JS.

This ensures that it is always transformed to Math.pow(2, 4) by babel. Which is at least ES5 supporting

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Nov 19, 2024 10:05am

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Size Change: +657 B (+0.02%)

Total Size: 3.11 MB

Filename	Size	Change
dist/array.full.js	356 kB	+73 B (+0.02%)
dist/array.full.no-external.js	355 kB	+73 B (+0.02%)
dist/array.js	170 kB	+73 B (+0.04%)
dist/array.no-external.js	169 kB	+73 B (+0.04%)
dist/main.js	171 kB	+73 B (+0.04%)
dist/module.full.js	356 kB	+73 B (+0.02%)
dist/module.full.no-external.js	355 kB	+73 B (+0.02%)
dist/module.js	170 kB	+73 B (+0.04%)
dist/module.no-external.js	169 kB	+73 B (+0.04%)

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `dist/all-external-dependencies.js` | 204 kB | | `dist/array.full.es5.js` | 253 kB | | `dist/dead-clicks-autocapture.js` | 13.6 kB | | `dist/exception-autocapture.js` | 8.7 kB | | `dist/external-scripts-loader.js` | 2.19 kB | | `dist/recorder-v2.js` | 113 kB | | `dist/recorder.js` | 113 kB | | `dist/surveys-preview.js` | 56.6 kB | | `dist/surveys.js` | 62.1 kB | | `dist/tracing-headers.js` | 1.33 kB | | `dist/web-vitals.js` | 10.3 kB |

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