update my work milestone

.vscode/notebooks/my-work.github-issues

@@ -7,7 +7,7 @@
   {
     "kind": 2,
     "language": "github-issues",
-    "value": "// list of repos we work in\n$repos=repo:microsoft/vscode repo:microsoft/vscode-remote-release repo:microsoft/vscode-js-debug repo:microsoft/vscode-pull-request-github repo:microsoft/vscode-github-issue-notebooks repo:microsoft/vscode-internalbacklog\n\n// current milestone name\n$milestone=milestone:\"July 2021\""
+    "value": "// list of repos we work in\n$repos=repo:microsoft/vscode repo:microsoft/vscode-remote-release repo:microsoft/vscode-js-debug repo:microsoft/vscode-pull-request-github repo:microsoft/vscode-github-issue-notebooks repo:microsoft/vscode-internalbacklog\n\n// current milestone name\n$milestone=milestone:\"August 2021\""
   },
   {
     "kind": 1,