chore(deps): bump headers from 0.3.7 to 0.3.8 in /backend (#528)

Bumps [headers](https://github.com/hyperium/headers) from 0.3.7 to 0.3.8.
- [Release notes](https://github.com/hyperium/headers/releases)
- [Commits](https://github.com/hyperium/headers/compare/headers-v0.3.7...headers-v0.3.8)

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

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

backend/Cargo.lock

@@ -1285,9 +1285,9 @@ dependencies = [
 
 [[package]]
 name = "headers"
-version = "0.3.7"
+version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4cff78e5788be1e0ab65b04d306b2ed5092c815ec97ec70f4ebd5aee158aa55d"
+checksum = "f3e372db8e5c0d213e0cd0b9be18be2aca3d44cf2fe30a9d46a65581cd454584"
 dependencies = [
  "base64 0.13.0",
  "bitflags",
@@ -1296,7 +1296,7 @@ dependencies = [
  "http",
  "httpdate 1.0.2",
  "mime",
- "sha-1",
+ "sha1",
 ]
 
 [[package]]
@@ -3043,6 +3043,17 @@ dependencies = [
  "digest 0.10.3",
 ]
 
+[[package]]
+name = "sha1"
+version = "0.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "006769ba83e921b3085caa8334186b00cf92b4cb1a6cf4632fbccc8eff5c7549"
+dependencies = [
+ "cfg-if 1.0.0",
+ "cpufeatures",
+ "digest 0.10.3",
+]
+
 [[package]]
 name = "sha2"
 version = "0.8.2"