internal/lsp/debug: update hard-coded version for v0.8.4

For golang/go#52892

Change-Id: I15c8a1b72ab53a479329d0ddd0abfe959bf4a416
Reviewed-on: https://go-review.googlesource.com/c/tools/+/406017
gopls-CI: kokoro <noreply+kokoro@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Nooras Saba‎ <saba@golang.org>

internal/lsp/debug/info.go

diff --git a/internal/lsp/debug/info.go b/internal/lsp/debug/info.go
index 8a97722..0e1ba03 100644
--- a/internal/lsp/debug/info.go
+++ b/internal/lsp/debug/info.go
@@ -29,7 +29,7 @@
 )
 
 // Version is a manually-updated mechanism for tracking versions.
-const Version = "v0.8.3"
+const Version = "v0.8.4"
 
 // 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.