package.json: update vscode test electron dependency

Change-Id: I090e370356851af0fc2f4e98f6b4f915f81bc4d0
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/549242
Reviewed-by: Robert Findley <[email protected]>
TryBot-Result: kokoro <[email protected]>
Commit-Queue: Hyang-Ah Hana Kim <[email protected]>

Author: hyangah

package-lock.json

@@ -76,7 +76,7 @@
     "@types/sinon": "9.0.11",
     "@types/vscode": "1.67.0",
     "@vscode/debugadapter-testsupport": "1.58.0",
-    "@vscode/test-electron": "2.3.6",
+    "@vscode/test-electron": "2.3.8",
     "@vscode/vsce": "2.19.0",
     "adm-zip": "0.4.16",
     "esbuild": "0.17.10",