Remove group imports format checking

It makes too many suboptimal choices for now.

See
rust-lang/rustfmt#5083 (comment)
and
rust-lang/rustfmt#5083 (comment)

.github/workflows/check.yml

@@ -34,23 +34,6 @@ jobs:
           components: rustfmt
       - name: cargo fmt --check
         run: cargo fmt --check
-  # This is currently a dedicated job due to the rustfmt's `group_imports` configuration
-  # option being available on the nightly channel only as of February 2024.
-  # Once stabilized, can be merged with the `stable / fmt` job in this workflow.
-  # See: https://github.com/rust-lang/rustfmt/issues/5083
-  imports:
-    runs-on: ubuntu-latest
-    name: nightly / fmt (import grouping)
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: true
-      - name: Install nightly
-        uses: dtolnay/rust-toolchain@nightly
-        with:
-          components: rustfmt
-      - name: cargo +nightly fmt -- --config group_imports=one --check
-        run: cargo +nightly fmt -- --config group_imports=one --check
   clippy:
     runs-on: ubuntu-latest
     name: ${{ matrix.toolchain }} / clippy

Makefile

@@ -8,7 +8,6 @@ check:
 	cargo fmt --check
 	cargo clippy
 	cargo d --no-deps --all-features
-	cargo +nightly fmt -- --config group_imports=one --check
 
 .PHONY: doc
 doc:
@@ -36,10 +35,6 @@ faktory/tls:
 faktory/tls/kill:
 	docker compose -f docker/compose.yml down
 
-.PHONY: sort
-sort:
-	cargo +nightly fmt -- --config group_imports=one
-
 .PHONY: test
 test:
 	cargo t --locked --all-features --all-targets