feat(deps): update dependency sourcegraph to ^18.4.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
sourcegraph	dependencies	patch	^18.4.1	source

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Release Notes

sourcegraph/sourcegraph-extension-api

v18.4.1

Compare Source

Bug Fixes

• error emitted from one hover provider would break other hover providers (#​117) (f7a6d85)

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