fix(deps): bound web-worker to 1.2.0

[ctrlc03]

This PR bounds web-worker to a specific version, by removing the ^ symbol in the package.json file. Version 1.3.0 cause the following issue:

(node:1805) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.

/home/runner/work/ffjavascript/ffjavascript/node_modules/web-worker/node.js:17
import URL from 'url';
^^^^^^

SyntaxError: Cannot use import statement outside a module
    at wrapSafe (internal/modules/cjs/loader.js:[9](https://github.com/iden3/ffjavascript/actions/runs/7422450279/job/20197762249?pr=142#step:5:10)15:16)
    at Module._compile (internal/modules/cjs/loader.js:963:27)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:[10](https://github.com/iden3/ffjavascript/actions/runs/7422450279/job/20197762249?pr=142#step:5:11)27:10)
    at Module.load (internal/modules/cjs/loader.js:863:32)
    at Function.Module._load (internal/modules/cjs/loader.js:708:14)
    at ModuleWrap.<anonymous> (internal/modules/esm/translators.js:195:29)
    at ModuleJob.run (internal/modules/esm/module_job.js:145:37)
    at async Loader.import (internal/modules/esm/loader.js:182:24)
    at async formattedImport (/home/runner/work/ffjavascript/ffjavascript/node_modules/mocha/lib/nodejs/esm-utils.js:9:14)
    at async Object.exports.requireOrImport (/home/runner/work/ffjavascript/ffjavascript/node_modules/mocha/lib/nodejs/esm-utils.js:42:28)
    at async Object.exports.loadFilesAsync (/home/runner/work/ffjavascript/ffjavascript/node_modules/mocha/lib/nodejs/esm-utils.js:100:20)
    at async singleRun (/home/runner/work/ffjavascript/ffjavascript/node_modules/mocha/lib/cli/run-helpers.js:[12](https://github.com/iden3/ffjavascript/actions/runs/7422450279/job/20197762249?pr=142#step:5:13)5:3)
    at async Object.exports.handler (/home/runner/work/ffjavascript/ffjavascript/node_modules/mocha/lib/cli/run.js:370:5)
npm ERR! Test failed.  See above for more details.

This can also be observed in this automated pr: #142 and in this issue #143

This issue is currently blocking projects dependent on ffjavascript, either directly or indirectly via snarkjs.

fix #143