Remove Buffer polyfill patch from @web5/dids once 'buffer' package has been updated

[frankhinek]

Tracking update to this code:

web5-js/packages/dids/build/buffer-polyfill.cjs

Lines 5 to 8 in 0b63aaf

	// monkeypatch writeBigUInt64BE in polyfill bc its borked
	// can remove this if/when this PR is merged: https://github.com/feross/buffer/pull/280
	polyfilledBuffer.prototype.writeBigUInt64BE = Buffer.prototype.writeBigUInt64BE;
	globalThis.Buffer = polyfilledBuffer;

The changes in buffer PR 280 were merged in PR 334 but it doesn't appear that package has been published to NPM registry for years (last version is 6.0.3).

[mistermoe]

feross/buffer#335