editors/code: Change minimum VS Code from 1.78 to 1.83

It's been a year since we last bumped this (see #15904), and VS Code
1.83 is the first version that supports LSP 3.17.5 (via
vscode-languageclient 9.0.1).

https://code.visualstudio.com/updates/v1_83#_language-server-protocol

editors/code/src/client.ts

@@ -350,6 +350,7 @@ class ExperimentalFeatures implements lc.StaticFeature {
         _documentSelector: lc.DocumentSelector | undefined,
     ): void {}
     dispose(): void {}
+    clear(): void {}
 }
 
 class OverrideFeatures implements lc.StaticFeature {
@@ -369,6 +370,7 @@ class OverrideFeatures implements lc.StaticFeature {
         _documentSelector: lc.DocumentSelector | undefined,
     ): void {}
     dispose(): void {}
+    clear(): void {}
 }
 
 function isCodeActionWithoutEditsAndCommands(value: any): boolean {