[clangd] Bump vscode-clangd v0.0.20

CHANGELOG:
- update lsp dependencies to pickup the latest LSP 3.15
- better support for cu files

clang-tools-extra/clangd/clients/clangd-vscode/package-lock.json

@@ -1,6 +1,6 @@
 {
     "name": "vscode-clangd",
-    "version": "0.0.19",
+    "version": "0.0.20",
     "lockfileVersion": 1,
     "requires": true,
     "dependencies": {

clang-tools-extra/clangd/clients/clangd-vscode/package.json

@@ -2,7 +2,7 @@
     "name": "vscode-clangd",
     "displayName": "vscode-clangd",
     "description": "Clang Language Server",
-    "version": "0.0.19",
+    "version": "0.0.20",
     "publisher": "llvm-vs-code-extensions",
     "homepage": "https://clang.llvm.org/extra/clangd.html",
     "engines": {