Add note about toolchain support

Author: lnicola

thisweek/_posts/2025-03-03-changelog-275.adoc

@@ -10,6 +10,8 @@ Release: release:2025-03-03[] (`v0.3.2328`)
 
 The x86-64, AArch64 and ARM Linux binaries now target GLIBC 2.28, and will keep doing so for the foreseeable future, which might be until June 2029.
 
+In addition, this version drops support for toolchains older than 1.82.
+
 == New Features
 
 * pr:18987[] calculate drop glue and show it on hover.