(#24371) boost: fix aliasing violation in boost::container

Apply a patch to Boost 1.85.0 to fix aliasing violations within
boost::container that affect object construction when optimizations are
enabled.

Patch is taken from upstream commit
boostorg/container@20ad12f
The .gitignore change in the upstream patch was removed.

recipes/boost/all/conandata.yml

@@ -77,6 +77,10 @@ patches:
     - patch_file: "patches/1.82.0-locale-iconv-library-option.patch"
       patch_description: "Optional flag to specify iconv from either libc of libiconv"
       patch_type: "conan"
+    - patch_file: "patches/1.85.0-container-aliasing-violation-fix.patch"
+      patch_description: "Fix aliasing violation in boost::container"
+      patch_type: "official"
+      patch_source: "https://github.com/boostorg/container/commit/20ad12f20e661978e90dc7f36d8ab8ac05e5a5a9"
   "1.84.0":
     - patch_file: "patches/1.82.0-locale-iconv-library-option.patch"
       patch_description: "Optional flag to specify iconv from either libc of libiconv"