Auto merge of #28895 - servo:dependabot/cargo/libz-sys-1.1.8, r=jdm

Bump libz-sys from 1.1.5 to 1.1.8

Bumps [libz-sys](https://github.com/rust-lang/libz-sys) from 1.1.5 to 1.1.8.
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Cargo.lock

@@ -3548,9 +3548,9 @@ dependencies = [
 
 [[package]]
 name = "libz-sys"
-version = "1.1.5"
+version = "1.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f35facd4a5673cb5a48822be2be1d4236c1c99cb4113cab7061ac720d5bf859"
+checksum = "9702761c3935f8cc2f101793272e202c72b99da8f4224a19ddcf1279a6450bbf"
 dependencies = [
  "cc",
  "libc",