Bump lru-cache and provide `dispose()` method

[addaleax]

Bumping the dependency is just a drive-by; this is mostly for making sure that Agent instances in the cache are destroyed when no longer reachable.

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🦋 Changeset detected

Latest commit: 110efed71c42c4ec66d3a441a3a5a77b1ed1e4fd

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ----------- | ----- | | proxy-agent | Patch |

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