internal/lsp/debug: update hard-coded version for v0.9.4

For golang/go#54421

Change-Id: I051fd292f9697ad727b62e5b1f425a886d91f045
Reviewed-on: https://go-review.googlesource.com/c/tools/+/422904
Run-TryBot: Robert Findley <rfindley@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Suzy Mueller <suzmue@golang.org>

internal/lsp/debug/info.go

@@ -29,7 +29,7 @@ const (
 )
 
 // Version is a manually-updated mechanism for tracking versions.
-const Version = "v0.9.3"
+const Version = "v0.9.4"
 
 // ServerVersion is the format used by gopls to report its version to the
 // client. This format is structured so that the client can parse it easily.