Retry RPC requests on 408 HTTP error

[denbite]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• Commit messages follow the conventional commits spec
• If this is a code change: I have written unit tests.
• If this changes code in a published package: I have run pnpm changeset to create a changeset JSON document appropriate for this change.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

Non-mainnet networks may experience instability and return 408 HTTP errors, which could delay testing/development. However, this can be fixed by retrying requests.

Test Plan

Related issues/PRs

made #989 working without merge conflicts by minor code change

[changeset-bot]

🦋 Changeset detected

Latest commit: fe5b740

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@near-js/providers	Patch
@near-js/accounts	Patch
@near-js/cookbook	Patch
near-api-js	Patch
@near-js/wallet-account	Patch

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[frol]

Looks good to me. Thank you!