chore: update dependency com.squareup.okio:okio to v3.18.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.squareup.okio:okio	3.17.0 → 3.18.1

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Release Notes

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

v3.18.1

2026-07-28

• Fix: Restore binary-compatibility with Okio 3.17.x for Kotlin/Native users. When we introduced
  the new base64() function, we inadvertently changed the binary signature! Ugh! This is now
  fixed and we've automated binary-compatibility checking for Kotlin/Native going forward.

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.

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