release/v0.4.0 (#517)

Bump version to v0.4.0 and update CHANGELOG.md with the latest release
notes.

Author: chrapkowski-sg

CHANGELOG.md

@@ -1,5 +1,12 @@
 # scip-clang ChangeLog
 
+## v0.4.0 (beta)
+
+- Updated LLVM to version 21.
+  (https://github.com/sourcegraph/scip-clang/pull/513)
+- Dropped macOS x86 binaries; only ARM (Apple Silicon) is supported.
+  (https://github.com/sourcegraph/scip-clang/pull/515)
+
 ## v0.3.3 (beta)
 
 - Fixes missing symbols for template functions using `enable_if`.

indexer/Version.h

@@ -15,7 +15,7 @@ constexpr bool debugMode = true;
 constexpr bool debugMode = false;
 #endif
 
-#define VERSION "0.3.3"
+#define VERSION "0.4.0"
 #define LLVM_COMMIT \
   "2078da43e25a4623cab2d0d60decddf709aaea28" // Keep synced with fetch_deps.bzl