refs #14565 - merge vf release branch 5.1 in finc-master v5

* set new generator version at local/config/vufind/config.ini
* updates composer.lock

local/config/vufind/config.ini

@@ -103,7 +103,7 @@ showBulkOptions = false
 ; Should users be allowed to save searches in their accounts?
 allowSavedSearches = true
 ; Generator value to display in an HTML header <meta> tag:
-generator = "VuFind 5.0.1"
+generator = "VuFind 5.1"
 
 ; This section allows you to configure the mechanism used for storing user
 ; sessions.  Available types: File, Memcache, Database.