chore(deps): bump itertools from 0.10.3 to 0.10.4 in /backend (#592)

Bumps [itertools](https://github.com/rust-itertools/itertools) from 0.10.3 to 0.10.4.
- [Release notes](https://github.com/rust-itertools/itertools/releases)
- [Changelog](https://github.com/rust-itertools/itertools/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-itertools/itertools/compare/v0.10.3...v0.10.4)

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

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

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

backend/Cargo.lock

@@ -1614,9 +1614,9 @@ dependencies = [
 
 [[package]]
 name = "itertools"
-version = "0.10.3"
+version = "0.10.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9a9d19fa1e79b6215ff29b9d6880b706147f16e9b1dbb1e4e5947b5b02bc5e3"
+checksum = "d8bf247779e67a9082a4790b45e71ac7cfd1321331a5c856a74a9faebdab78d0"
 dependencies = [
  "either",
 ]
@@ -2421,7 +2421,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7345d5f0e08c0536d7ac7229952590239e77abf0a0100a1b1d890add6ea96364"
 dependencies = [
  "anyhow",
- "itertools 0.10.3",
+ "itertools 0.10.4",
  "proc-macro2",
  "quote",
  "syn",
@@ -3209,7 +3209,7 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f87e292b4291f154971a43c3774364e2cbcaec599d3f5bf6fa9d122885dbc38a"
 dependencies = [
- "itertools 0.10.3",
+ "itertools 0.10.4",
  "nom",
  "unicode_categories",
 ]
@@ -4481,7 +4481,7 @@ dependencies = [
  "headers",
  "hex",
  "hyper 0.14.20",
- "itertools 0.10.3",
+ "itertools 0.10.4",
  "json-pointer",
  "lettre",
  "magic-crypt",