fix nixpkgs to 25.11, update to new zig api

build.zig

@@ -19,9 +19,11 @@ pub fn build(b: *std.Build) void {
         .name = "zremap",
         // In this case the main source file is merely a path, however, in more),
         // complicated build scripts, this could be a generated file.
-        .root_source_file = b.path("src/main.zig"),
-        .target = target,
-        .optimize = optimize,
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("src/main.zig"),
+            .target = target,
+            .optimize = optimize,
+        }),
     });
     exe.linkLibC();
     exe.linkSystemLibrary("evdev");
@@ -57,9 +59,11 @@ pub fn build(b: *std.Build) void {
     // Creates a step for unit testing. This only builds the test executable
     // but does not run it.
     const unit_tests = b.addTest(.{
-        .root_source_file = b.path("src/main.zig"),
-        .target = target,
-        .optimize = optimize,
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("src/main.zig"),
+            .target = target,
+            .optimize = optimize,
+        }),
     });
 
     const run_unit_tests = b.addRunArtifact(unit_tests);