Update dependency com.squareup.okio:okio to v3.18.2

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
com.squareup.okio:okio	3.18.1 → 3.18.2

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Release Notes

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

v3.18.2

2026-09-04

• Fix: Don't change behavior of base64-encoding. We introduced a bug in Okio 3.18.1 that caused
  base64 strings to be encoded without padding, even though the previous and expected behavior is
  to encode such strings with padding (= characters). The bug impacts callers who compiled
  against Okio releases < 3.18.0, and executed on Okio releases >= 3.18.

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