Bump zerocopy from 0.7.21 to 0.7.31 in /packages/backend

Bumps [zerocopy](https://github.com/google/zerocopy) from 0.7.21 to 0.7.31.
- [Release notes](https://github.com/google/zerocopy/releases)
- [Changelog](https://github.com/google/zerocopy/blob/main/CHANGELOG.md)
- [Commits](https://github.com/google/zerocopy/compare/v0.7.21...v0.7.31)

---
updated-dependencies:
- dependency-name: zerocopy
  dependency-type: indirect
...

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

packages/backend/Cargo.lock

@@ -1552,18 +1552,18 @@ checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
 
 [[package]]
 name = "zerocopy"
-version = "0.7.21"
+version = "0.7.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "686b7e407015242119c33dab17b8f61ba6843534de936d94368856528eae4dcc"
+checksum = "1c4061bedbb353041c12f413700357bec76df2c7e2ca8e4df8bac24c6bf68e3d"
 dependencies = [
  "zerocopy-derive",
 ]
 
 [[package]]
 name = "zerocopy-derive"
-version = "0.7.21"
+version = "0.7.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "020f3dfe25dfc38dfea49ce62d5d45ecdd7f0d8a724fa63eb36b6eba4ec76806"
+checksum = "b3c129550b3e6de3fd0ba67ba5c81818f9805e58b8d7fee80a3a59d2c9fc601a"
 dependencies = [
  "proc-macro2",
  "quote",