chore(deps): bump spki from 0.5.3 to 0.5.4 (#763)

Bumps [spki](https://github.com/RustCrypto/formats) from 0.5.3 to 0.5.4.
- [Release notes](https://github.com/RustCrypto/formats/releases)
- [Commits](https://github.com/RustCrypto/formats/compare/spki/v0.5.3...spki/v0.5.4)

---
updated-dependencies:
- dependency-name: spki
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.lock

@@ -3410,9 +3410,9 @@ checksum = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
 
 [[package]]
 name = "spki"
-version = "0.5.3"
+version = "0.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "964d3a6f8b7ef6d6d20887f4c30c4848f4ffa05f600c87277d30a5b4fe32cb4b"
+checksum = "44d01ac02a6ccf3e07db148d2be087da624fea0221a16152ed01f0496a6b0a27"
 dependencies = [
  "base64ct",
  "der",

ethers-signers/Cargo.toml

@@ -35,7 +35,7 @@ rusoto_core = { version = "0.47.0", optional = true }
 rusoto_kms = { version = "0.47.0", optional = true }
 tracing = { version = "0.1.29", optional = true }
 tracing-futures = { version = "0.2.5", optional = true }
-spki = { version = "0.5.2", optional = true }
+spki = { version = "0.5.4", optional = true }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 eth-keystore = { version = "0.3.0" }