cargo: import fix_filter from gix::filter::plumbing

I don't think we need to declare these dependencies separately because both
are the optional dependencies enabled by the git feature.

We'll also need the gix's "attributes" feature at some point.
> attributes - Query attributes and excludes. Enables access to pathspecs,
> worktree checkouts, filter-pipelines and submodules.
https://docs.rs/gix/0.67.0/gix/index.html#feature-flags

Cargo.lock

@@ -1872,7 +1872,6 @@ dependencies = [
  "futures 0.3.31",
  "git2",
  "gix",
- "gix-filter",
  "glob",
  "hashbrown 0.15.1",
  "hex",

Cargo.toml

@@ -58,11 +58,11 @@ git2 = { version = "0.19.0", features = [
     "vendored-libgit2"
 ] }
 gix = { version = "0.66.0", default-features = false, features = [
+    "attributes",
+    "blob-diff",
     "index",
     "max-performance-safe",
-    "blob-diff",
 ] }
-gix-filter = "0.13.0"
 glob = "0.3.1"
 hashbrown = { version = "0.15.1", default-features = false, features = ["inline-more"] }
 hex = "0.4.3"

lib/Cargo.toml

@@ -45,7 +45,6 @@ either = { workspace = true }
 futures = { workspace = true }
 git2 = { workspace = true, optional = true }
 gix = { workspace = true, optional = true }
-gix-filter = { workspace = true, optional = true }
 glob = { workspace = true }
 hashbrown = { workspace = true }
 hex = { workspace = true }
@@ -97,7 +96,7 @@ tokio = { workspace = true, features = ["full"] }
 
 [features]
 default = ["git"]
-git = ["dep:git2", "dep:gix", "dep:gix-filter"]
+git = ["dep:git2", "dep:gix"]
 vendored-openssl = ["git2/vendored-openssl"]
 watchman = ["dep:tokio", "dep:watchman_client"]
 testing = ["git"]

lib/src/git_backend.rs

@@ -430,7 +430,7 @@ impl GitBackend {
         );
         let filter = gix::diff::blob::Pipeline::new(
             Default::default(),
-            gix_filter::Pipeline::new(
+            gix::filter::plumbing::Pipeline::new(
                 self.git_repo()
                     .command_context()
                     .map_err(|err| BackendError::Other(Box::new(err)))?,