chore(ci): stop installing musl-dev manually

It's already included by default starting from rust-lang/docker-rust#259

Author: paolobarbolini

.gitlab-ci.yml

@@ -21,7 +21,6 @@ rust:clippy:
   stage: test
   image: rust:1.92-alpine3.23
   before_script:
-    - apk add musl-dev
     - rustup component add clippy
   script:
     - cargo clippy --all-features -- -D warnings
@@ -30,15 +29,13 @@ rust:hack:
   stage: test
   image: rust:1.92-alpine3.23
   before_script:
-    - apk add musl-dev cargo-hack
+    - apk add cargo-hack
   script:
     - cargo hack check --feature-powerset --no-dev-deps
 
 rust:test:
   stage: test
   image: rust:1.92-alpine3.23
-  before_script:
-    - apk add musl-dev
   script:
     - cargo test
     - cargo test --features axum