fix(vscode): update stale RF version UI strings from 4.1 to 5.0

The quick-pick dialog shown when environment validation fails still
referenced 'robotframework version 4.1 or higher' in both the
'Select Python Interpreter' detail and the 'Retry' detail text.
The actual enforced minimum has been 5.0 since commit 02cf495
(refactor: introduce RF_VERSION constant and remove RF < 5.0 dead code).

Closes #603

Author: DaniMarts

vscode-client/extension/languageclientsmanger.ts

@@ -366,7 +366,7 @@ export class LanguageClientsManager {
           id: "select",
           label: "Select Python Interpreter...",
           detail:
-            "Choose a Python interpreter version 3.10 or newer that has `robotframework` version 4.1 or higher installed",
+            "Choose a Python interpreter version 3.10 or newer that has `robotframework` version 5.0 or higher installed",
         },
         {
           id: "create",
@@ -379,7 +379,7 @@ export class LanguageClientsManager {
                 id: "retry",
                 label: "Retry",
                 detail:
-                  "Install `robotframework` version 4.1 or higher manually in the current environment, then restart the language server",
+                  "Install `robotframework` version 5.0 or higher manually in the current environment, then restart the language server",
               },
             ]
           : []),