chore: update to Zig 0.13.0

.gitignore

@@ -1,2 +1,2 @@
-zig-cache/
+.zig-cache/
 zig-out/

build.zig

@@ -5,11 +5,11 @@ pub fn build(b: *std.Build) !void {
     const optimize = b.standardOptimizeOption(.{});
 
     _ = b.addModule("globlin", .{
-        .root_source_file = .{ .path = "src/glob.zig" },
+        .root_source_file = b.path("src/glob.zig"),
     });
 
     const test_exe = b.addTest(.{
-        .root_source_file = .{ .path = "src/glob.zig" },
+        .root_source_file = b.path("src/glob.zig"),
         .target = target,
         .optimize = optimize,
     });