chore(deps): Bump memchr from 2.8.0 to 2.8.1

Bumps [memchr](https://github.com/BurntSushi/memchr) from 2.8.0 to 2.8.1.
- [Commits](https://github.com/BurntSushi/memchr/compare/2.8.0...2.8.1)

---
updated-dependencies:
- dependency-name: memchr
  dependency-version: 2.8.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

filtermail/Cargo.lock

@@ -1308,9 +1308,9 @@ dependencies = [
 
 [[package]]
 name = "memchr"
-version = "2.8.0"
+version = "2.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f8ca58f447f06ed17d5fc4043ce1b10dd205e060fb3ce5b979b8ed8e59ff3f79"
+checksum = "6b947ae49db0d222b1dbc6b113ce7248a3fc3a6ca21b696717bfc000ba4484d8"
 
 [[package]]
 name = "mio"

filtermail/Cargo.toml

@@ -16,7 +16,7 @@ serini = "0.2.2"
 tokio = { version = "1.52.3", features = ["full"] }
 thiserror = "2.0.18"
 mailparse = "0.16.1"
-memchr = "2.8.0"
+memchr = "2.8.1"
 log = "0.4.29"
 env_logger = "0.11.10"
 governor = { version = "0.10.4", default-features = false, features = [