Version 1.15.1

• Update bundled fmt version to 11.1.3 by @gabime in #3332
• Use fwrite_unlocked() if available by @gabime in #3276 and #3318
• On-demand truncation for basic file sinks by @matteodelseppia in #3280
• Allow manual rotation of rotating_file_sink by @hjs-ast in #3269
• Make null_sink final by @gabime in #3267
• Fix: Add explicit fmt:: and std:: to avoid ambiguous calls by @LiAuTraver in #3259
• Fix: Pass /utf-8 only when the compiler is MSVC by @miyanyan in #3260
• Fix: Support bin_to_hex() when using std::format by @koniarik in #3315
• Support custom environment variables for load_env_levels by @ken-matsui in #3327
• Fix: Added a lock to rotate_now() by @matteodelseppia in #3281
• Fix: Update to_string_view function for fmt 11.1 by @chenrui333 in #3301
• Fix: Remove unused to_string_view overload in fmt >= 11.1 by @jdrouhard in #3314
• Fix: Use string_view_literals to resolve issues #3287 and #3233 by @yalov in #3291
• Fix: Added a lock to set_color_mode(..) in ansicolor_sink by @gabime in #3323
• Fix: Corrected comment in daily_file_sink by @F1F88 in #3249
• Fix: Compatibility with fmtlib 11.1.1 by @yachoor in #3331

Full Changelog: v1.15.0...v1.15.1

Special thanks to @tt4g for helping with community questions and issues