update netlify hugo version

netlify.toml

@@ -3,7 +3,7 @@ publish = "public"
 command = "hugo --gc --minify"
 
 [context.production.environment]
-HUGO_VERSION = "0.54.0"
+HUGO_VERSION = "0.56.0"
 HUGO_ENV = "production"
 HUGO_ENABLEGITINFO = "true"
 
@@ -11,20 +11,20 @@ HUGO_ENABLEGITINFO = "true"
 command = "hugo --gc --minify --enableGitInfo"
 
 [context.split1.environment]
-HUGO_VERSION = "0.54.0"
+HUGO_VERSION = "0.56.0"
 HUGO_ENV = "production"
 
 [context.deploy-preview]
 command = "hugo --gc --minify --buildFuture -b $DEPLOY_PRIME_URL"
 
 [context.deploy-preview.environment]
-HUGO_VERSION = "0.54.0"
+HUGO_VERSION = "0.56.0"
 
 [context.branch-deploy]
 command = "hugo --gc --minify -b $DEPLOY_PRIME_URL"
 
 [context.branch-deploy.environment]
-HUGO_VERSION = "0.54.0"
+HUGO_VERSION = "0.56.0"
 
 [context.next.environment]
 HUGO_ENABLEGITINFO = "true"