[TASK] Update suggested dependency for phpspreadsheet

- raise version numbers
- suggest the direct use of `phpoffice/phpspreadsheet` via composer
- suggest `EXT:base_excel` for legacy installations

Related: #1214

Author: mschwemer

composer.json

@@ -39,8 +39,8 @@
 		"ext-curl": "*"
 	},
 	"suggest": {
-		"sjbr/static-info-tables": "*",
-		"jambagecom/base-excel": "^v1.29.0"
+		"sjbr/static-info-tables": "Provides country information for the country field",
+		"phpoffice/phpspreadsheet": "Enables xlsx export via the powermail module"
 	},
 	"replace": {
 		"typo3-ter/powermail": "self.version"

ext_emconf.php

@@ -19,6 +19,7 @@
         'conflicts' => [
         ],
         'suggests' => [
+            'base_excel' => '',
             'static_info_tables' => ''
         ],
     ],