fix: pin base64ct to version 1.6.0 to avoid Edition 2024 requirement and resolve CI dependency parsing errors

Cargo.lock

@@ -678,9 +678,9 @@ checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
 
 [[package]]
 name = "base64ct"
-version = "1.8.0"
+version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "55248b47b0caf0546f7988906588779981c43bb1bc9d0c44087278f80cdb44ba"
+checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
 [[package]]
 name = "bit-set"
@@ -2417,6 +2417,7 @@ dependencies = [
  "alloy-sol-types",
  "anyhow",
  "base64",
+ "base64ct",
  "bytes",
  "chrono",
  "criterion",

Cargo.toml

@@ -13,6 +13,8 @@ documentation = "https://docs.rs/polyfill-rs"
 homepage = "https://github.com/floor-licker/polyfill-rs"
 
 [dependencies]
+# Pin base64ct to avoid Edition 2024 requirement
+base64ct = "=1.6.0"
 # Async runtime and futures
 tokio = { version = "1.41", features = ["full"] }
 futures = "0.3"