Update okio to v3.18.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.squareup.okio:okio-fakefilesystem	3.17.0 → 3.18.0
com.squareup.okio:okio	3.17.0 → 3.18.0
com.squareup.okio:okio-bom	3.17.0 → 3.18.0

---

Release Notes

lysine-dev/okio (com.squareup.okio:okio-fakefilesystem)

v3.18.0

2026-07-21

• Fix: Use wide character APIs to better support of non-UTF-8 filesystems on Windows.
• Fix: Don't crash in AssetFileSystem.exists() when the underlying storage throws a
  FileNotFoundException.
• Fix: Load WASI paths relative to their preopen. The platform behavior recently changed in
  NodeJS, causing our WasiFileSystem to be unable to access files!
• New: Optionally ignore whitespace when decoding hexadecimal.
• New: Optionally omit padding when encoding Base64.
• New: BufferedSource.readUInt(), BufferedSink.writeUInt(), and similar functions for UByte,
  UShort and ULong. Also add support for unsigned and little-endian.
• New: BufferedSink.utf8Appendable(). Use this to adapt an Okio sink to an Appendable.
• New: Source.limit() returns a wrapped source with a strict limit on how many bytes are
  returned.
• New: ByteString.equals(other, constantTime) for subtle defense against timing attacks.

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • At any time (no schedule defined)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[square-task-list-completed]

Task List Completed has been disabled for this PR, either by the disabled label or repo topic

Remaining tasks

• If you want to rebase/retry this PR, check this box

Why am I seeing this comment?

This comment is a summary of the pending tasks on this PR. It is intended to make it easier to find pending tasks so you can ship your PR faster.

Got feedback? Let us know in #dx-help!

Want to disable me? Add task-list-completed-disable as a repo topic or PR label to disable on a whole PR, or write task-list-completed-disable in a comment to disable it for that comment.

[square-task-list-completed]

Task List Completed has been disabled for this PR, either by the disabled label or repo topic

Remaining tasks

• If you want to rebase/retry this PR, check this box

Why am I seeing this comment?

This comment is a summary of the pending tasks on this PR. It is intended to make it easier to find pending tasks so you can ship your PR faster.

Got feedback? Let us know in #dx-help!

Want to disable me? Add task-list-completed-disable as a repo topic or PR label to disable on a whole PR, or write task-list-completed-disable in a comment to disable it for that comment.