Update changelog and version for 1.21.1. (#12449)

* Update changelog and version for 1.21.1.

Extension/CHANGELOG.md

@@ -1,5 +1,27 @@
 # C/C++ for Visual Studio Code Changelog
 
+## Version 1.21.1: July 15, 2024
+### Enhancements
+* Add `see` and `sa` to the `C_Cpp.doxygen.sectionTags` setting. [#12384](https://github.com/microsoft/vscode-cpptools/issues/12384)
+* Update the vcpkg header database. [PR #12430](https://github.com/microsoft/vscode-cpptools/pull/12430)
+* Disable the pre-release prompt if the `extensions.ignoreRecommendations` setting is `true`. [#12438](https://github.com/microsoft/vscode-cpptools/issues/12438)
+* Switch to an alternative workspace symbol search implementation (performance and results will be slightly different from previous versions).
+* Various IntelliSense engine updates/fixes.
+
+### Bug Fixes
+* Fix a crash if the Ryzen 3000 doesn't have updated drivers. [#12201](https://github.com/microsoft/vscode-cpptools/issues/12201)
+* Fix relative paths in `compile_commands.json` to be relative to the `compile_commands.json`'s directory. [#12290](https://github.com/microsoft/vscode-cpptools/issues/12290)
+* Fix a tag parser performance regression. [#12292](https://github.com/microsoft/vscode-cpptools/issues/12292)
+* Fix code analysis, find all references, and rename from getting the wrong configuration for non-open files on the first run when using a configuration provider. [#12313](https://github.com/microsoft/vscode-cpptools/issues/12313)
+* Fix potential crashes. [#12354](https://github.com/microsoft/vscode-cpptools/issues/12354)
+* Fix the language status not showing it's busy while the tag parser is initializing. [#12403](https://github.com/microsoft/vscode-cpptools/issues/12403)
+* Fix the vcpkg code action not appearing for missing headers available via vcpkg. [#12413](https://github.com/microsoft/vscode-cpptools/issues/12413)
+* Fix custom configurations sometimes not getting used. [PR #12427](https://github.com/microsoft/vscode-cpptools/pull/12427)
+* Fix a code analysis error when using gcc 14. [#12428](https://github.com/microsoft/vscode-cpptools/issues/12428)
+* Fix a cause of colorization, inactive regions, and inlay hints getting cleared when an update is pending.
+* Fix a cause of semantic tokens transiently being placed in the wrong location.
+* Fix a potential deadlock when configured using compile commands.
+
 ## Version 1.21.0: June 17, 2024
 ### Bug Fixes
 * Stop logging file watch events for excluded files. [#11455](https://github.com/microsoft/vscode-cpptools/issues/11455)

Extension/package.json

@@ -2,7 +2,7 @@
     "name": "cpptools",
     "displayName": "C/C++",
     "description": "C/C++ IntelliSense, debugging, and code browsing.",
-    "version": "1.21.0-main",
+    "version": "1.21.1-main",
     "publisher": "ms-vscode",
     "icon": "LanguageCCPP_color_128x.png",
     "readme": "README.md",