Update netlify.toml (#389)

Author: Arhell

netlify.toml

@@ -1,11 +1,11 @@
 [context.production.environment]
-  HUGO_VERSION = "0.115.3"
+  HUGO_VERSION = "0.115.4"
 
 [context.deploy-preview.environment]
-  HUGO_VERSION = "0.115.3"
+  HUGO_VERSION = "0.115.4"
 
 [context.branch-deploy.environment]
-  HUGO_VERSION = "0.115.3"
+  HUGO_VERSION = "0.115.4"
 
 [context.deploy-preview]
 command = "cd themes/docsy && git submodule update -f --init && cd ../.. && hugo --gc --minify"