fix build with Zig 0.12.0

build.zig

@@ -83,18 +83,23 @@ pub fn build(b: *std.Build) void {
 
     // ----------------------------- Code Coverage -----------------------------
 
+    const addOutputDirectoryArg = comptime if (@import("builtin").zig_version.order(.{ .major = 0, .minor = 13, .patch = 0 }) == .lt)
+        std.Build.Step.Run.addOutputFileArg
+    else
+        std.Build.Step.Run.addOutputDirectoryArg;
+
     const kcov_merge = std.Build.Step.Run.create(b, "kcov merge coverage");
     kcov_merge.rename_step_with_output_arg = false;
     kcov_merge.addArg("kcov");
     kcov_merge.addArg("--merge");
-    const coverage_output = kcov_merge.addOutputDirectoryArg(".");
+    const coverage_output = addOutputDirectoryArg(kcov_merge, ".");
 
     for ([_]*std.Build.Step.Compile{ lsp_tests, lsp_parser_tests }) |test_artifact| {
         const kcov_collect = std.Build.Step.Run.create(b, "kcov collect coverage");
         kcov_collect.addArg("kcov");
         kcov_collect.addArg("--collect-only");
         kcov_collect.addPrefixedDirectoryArg("--include-pattern=", b.path("."));
-        kcov_merge.addDirectoryArg(kcov_collect.addOutputDirectoryArg(test_artifact.name));
+        kcov_merge.addDirectoryArg(addOutputDirectoryArg(kcov_collect, test_artifact.name));
         kcov_collect.addArtifactArg(test_artifact);
         kcov_collect.enableTestRunnerMode();
     }