Update comby/comby Docker tag to v0.18.2

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
comby/comby	stage	patch	0.18.2	source
comby/comby	final	patch	0.18.2	source

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Release Notes

comby-tools/comby

v0.18.2

Compare Source

• Make identifier optional in regex holes.

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