Update Rust crate once_cell to v1.21.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
once_cell	dependencies	patch	1.21.1 -> 1.21.3

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Release Notes

matklad/once_cell (once_cell)

v1.21.3

Compare Source

• Outline more initialization in race: #​284,
  #​285.

v1.21.2

Compare Source

• Relax success ordering from AcqRel to Release in race: #​278.

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Configuration

📅 Schedule: Branch creation - "* 0-3 * * 1" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: Cargo.lock

Command failed: cargo update --config net.git-fetch-with-cli=true --manifest-path packages/primitives/leptos/focus-scope/Cargo.toml --workspace
error: current package believes it's in a workspace when it's not:
current:   /tmp/renovate/repos/github/RustForWeb/radix/packages/primitives/leptos/focus-scope/Cargo.toml
workspace: /tmp/renovate/repos/github/RustForWeb/radix/Cargo.toml

this may be fixable by adding `packages/primitives/leptos/focus-scope` to the `workspace.members` array of the manifest located at: /tmp/renovate/repos/github/RustForWeb/radix/Cargo.toml
Alternatively, to keep it out of the workspace, add the package to the `workspace.exclude` array, or add an empty `[workspace]` table to the package's manifest.