Bump eth.zig to v0.2.1 (#3)

Performance release with 18/24 benchmark wins against alloy.rs.

Author: koko1123

build.zig.zon

@@ -4,8 +4,8 @@
     .fingerprint = 0xfab90a2f402a7502,
     .dependencies = .{
         .eth = .{
-            .url = "git+https://github.com/StrobeLabs/eth.zig.git#v0.2.0",
-            .hash = "eth_zig-0.1.0-efEm-gsOCACU8SzMaQk-qAXvcTOQHQGFvB5rtLEoEvXe",
+            .url = "git+https://github.com/StrobeLabs/eth.zig.git#v0.2.1",
+            .hash = "eth_zig-0.1.0-efEm-mBYCAAEZCIHYBY6W4RtxhsMuIo6O3DwoibwCTW-",
         },
     },
     .paths = .{