chore(deps): bump lru from 0.14.0 to 0.15.0

Bumps [lru](https://github.com/jeromefroe/lru-rs) from 0.14.0 to 0.15.0.
- [Changelog](https://github.com/jeromefroe/lru-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jeromefroe/lru-rs/compare/0.14.0...0.15.0)

---
updated-dependencies:
- dependency-name: lru
  dependency-version: 0.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Cargo.lock

@@ -1518,9 +1518,9 @@ checksum = "13dc2df351e3202783a1fe0d44375f7295ffb4049267b0f3018346dc122a1d94"
 
 [[package]]
 name = "lru"
-version = "0.14.0"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9f8cc7106155f10bdf99a6f379688f543ad6596a415375b36a59a054ceda1198"
+checksum = "0281c2e25e62316a5c9d98f2d2e9e95a37841afdaf4383c177dbb5c1dfab0568"
 dependencies = [
  "hashbrown",
 ]

rpxy-lib/Cargo.toml

@@ -108,7 +108,7 @@ socket2 = { version = "0.5.10", features = ["all"], optional = true }
 
 # cache
 http-cache-semantics = { path = "../submodules/rusty-http-cache-semantics", default-features = false, optional = true }
-lru = { version = "0.14.0", optional = true }
+lru = { version = "0.15.0", optional = true }
 sha2 = { version = "0.10.9", default-features = false, optional = true }
 
 # cookie handling for sticky cookie