Update actions/cache digest to 6849a64

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
actions/cache	action	digest	3624ceb -> 6849a64

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[zed-industries-bot]

	Warnings
:warning:	This PR doesn't include changes to `extensions.toml`. If you are creating a new extension, add a new entry to it. If you are updating an existing extension, update the version number in the corresponding entry.

Generated by :no_entry_sign: dangerJS against 7fdc1f56f2d4103feae7a995d752306537b49b7a