Update okio to v3.18.1

[juul-mobile-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
com.squareup.okio:okio-js	3.18.0 → 3.18.1
com.squareup.okio:okio	3.18.0 → 3.18.1

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Release Notes

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

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.

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This PR has been generated by Mend Renovate CLI.

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Note

Low Risk
Single version-catalog patch bump with no code changes; low risk, with a small benefit for Kotlin/Native consumers of the library.

Overview
Bumps the shared okio version in gradle/libs.versions.toml from 3.18.0 to 3.18.1, which applies to both okio-core and okio-js via version.ref.

This is a patch dependency update only; no project source changes. 3.18.1 restores Kotlin/Native binary compatibility with 3.17.x after a signature change around base64(), which matters for this repo’s multiplatform targets (e.g. koap-core on macOS/iOS and JS).

^{Reviewed by Cursor Bugbot for commit 46f7e54. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.04%. Comparing base (8cb7ef8) to head (46f7e54).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #455   +/-   ##
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  Coverage   69.04%   69.04%           
=======================================
  Files           9        9           
  Lines         798      798           
  Branches      217      217           
=======================================
  Hits          551      551           
  Misses        161      161           
  Partials       86       86           

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