avendish: bump to 2b1519dac (dump-PCH portability fix)

Author: jcelerier

CMakeLists.txt

@@ -18,7 +18,7 @@ if(NOT Avendish_FOUND)
   FetchContent_Declare(
     Avendish
     GIT_REPOSITORY "https://github.com/celtera/avendish"
-    GIT_TAG 32970cb475b6142d272cd859878e4bd22bcd5323)
+    GIT_TAG 2b1519daca5c9bc2ea2e773133304cf2b51a2dd6)
   FetchContent_Populate(Avendish)
   list(APPEND CMAKE_PREFIX_PATH "${avendish_SOURCE_DIR}")
   find_package(Avendish REQUIRED)