Bump version to v0.26.4 (#3821)

Co-authored-by: github-actions <[email protected]>

Author: shopify-github-actions-access[bot]

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    ruby-lsp (0.26.3)
+    ruby-lsp (0.26.4)
       language_server-protocol (~> 3.17.0)
       prism (>= 1.2, < 2.0)
       rbs (>= 3, < 5)

VERSION

@@ -1 +1 @@
-0.26.3
+0.26.4