Update known issues in the bug report template

Author: lnicola

.github/ISSUE_TEMPLATE/bug_report.md

@@ -13,7 +13,9 @@ Forum for questions: https://users.rust-lang.org/c/ide/14
 
 Before submitting, please make sure that you're not running into one of these known issues:
 
- 1. on-the-fly diagnostics are mostly unimplemented (`cargo check` diagnostics will be shown when saving a file): #3107
+ 1. extension doesn't load in VSCodium: #11080
+ 2. VS Code Marketplace serves old stable version: #11098
+ 3. on-the-fly diagnostics are mostly unimplemented (`cargo check` diagnostics will be shown when saving a file): #3107
 
 Otherwise please try to provide information which will help us to fix the issue faster. Minimal reproducible examples with few dependencies are especially lovely <3.
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