Add Cargo.lock of workspace. Use fixed references.

.github/workflows/on_pull_request_build_contracts.yml

@@ -10,4 +10,4 @@ jobs:
   build:
     uses: multiversx/mx-sc-actions/.github/workflows/[email protected]
     with:
-      image_tag: v4.1.4
+      image_tag: v4.2.0

.github/workflows/release.yml

@@ -11,5 +11,5 @@ jobs:
   build:
     uses: multiversx/mx-sc-actions/.github/workflows/[email protected]
     with:
-      image_tag: v4.1.4
+      image_tag: v4.2.0
       attach_to_existing_release: true

.gitignore

@@ -2,10 +2,6 @@
 # will have compiled files and executables
 **/target/
 **/output/
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
-!**/wasm*/Cargo.lock
 
 # These are backup files generated by rustfmt
 **/*.rs.bk