build(deps): bump @solana/instruction-plans from 6.7.0 to 6.8.0 (#622)

Bumps [@solana/instruction-plans](https://github.com/anza-xyz/kit) from 6.7.0 to 6.8.0.
- [Release notes](https://github.com/anza-xyz/kit/releases)
- [Commits](anza-xyz/kit@v6.7.0...v6.8.0)

---
updated-dependencies:
- dependency-name: "@solana/instruction-plans"
  dependency-version: 6.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

clients/js/package.json

@@ -38,7 +38,7 @@
     "@solana/addresses": "6.7.0",
     "@solana/functional": "6.7.0",
     "@solana/instructions": "6.8.0",
-    "@solana/instruction-plans": "6.7.0",
+    "@solana/instruction-plans": "6.8.0",
     "@solana/rpc-api": "6.8.0",
     "@solana/rpc-spec": "6.7.0",
     "@solana/transaction-messages": "6.7.0"