fix: json rpc provider timeout config

[vasyl-ivanchuk]

What ❔

Fix JSON RPC Provider timeout configuration.

Why ❔

This was overlooked when the explorer was migrated from an old SDK with ethers v5 to a new SDK with ethers v6.

Checklist

• [X] PR title corresponds to the body of PR (we generate changelog entries from PRs).
• [X] Tests for the changes have been added / updated.

[github-actions[bot]]

API E2E Test Results

207 tests   207 ✅  20s ⏱️  14 suites    0 💤   1 files      0 ❌

Results for commit eb5f97d3.

:recycle: This comment has been updated with latest results.

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Unit Test Results

    4 files    263 suites   11m 26s ⏱️ 2 121 tests 2 120 ✅ 1 💤 0 ❌ 2 330 runs  2 329 ✅ 1 💤 0 ❌

Results for commit eb5f97d3.

:recycle: This comment has been updated with latest results.

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Visit the preview URL for this PR: https://staging-scan-v2--pr-302-2y89z742.web.app

[github-actions[bot]]

:tada: This PR is included in version 2.50.2 :tada:

The release is available on:

• v2.50.2
• v2.50.2
• v2.50.2
• GitHub release

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