chore(bench): pin mvnw to LF so the wrapper runs on Linux/macOS/WSL

The unix `mvnw` wrapper is stored LF in git, but a Windows checkout (autocrlf)
materializes it CRLF, leaving its shebang unrunnable when the working tree is
used from WSL/Linux. Pin `mvnw text eol=lf` (and `mvnw.cmd text eol=crlf`) so
every checkout keeps the wrapper cross-platform-runnable.

Author: DemchaAV

.gitattributes

@@ -1,3 +1,8 @@
 # Shell scripts must keep LF endings so they run on Linux/macOS regardless of
 # the contributor's core.autocrlf setting (a CRLF shebang breaks on Unix).
 *.sh text eol=lf
+
+# Maven wrapper: the POSIX `mvnw` must stay LF to execute on Linux/macOS/WSL
+# (a CRLF shebang is unrunnable there); the Windows `mvnw.cmd` batch stays CRLF.
+mvnw text eol=lf
+mvnw.cmd text eol=crlf