ci: replace deprecated --all with --workspace

According to the docs `--all` is a deprecated alias for `--workspace`

.github/workflows/build.yml

@@ -33,13 +33,13 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: build
-          args: --all
+          args: --workspace
 
       - name: Run all tests
         uses: actions-rs/cargo@v1
         with:
           command: test
-          args: --all --all-features
+          args: --workspace --all-features
 
       - name: Check formatting
         uses: actions-rs/cargo@v1
@@ -63,13 +63,13 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: build
-          args: --all --features=coconut
+          args: --workspace --features=coconut
 
       - name: Run all tests with coconut enabled
         uses: actions-rs/cargo@v1
         with:
           command: test
-          args: --all --features=coconut
+          args: --workspace --features=coconut
 
       - name: Run clippy with coconut enabled
         uses: actions-rs/cargo@v1

.github/workflows/contracts.yml

@@ -45,7 +45,7 @@ jobs:
           RUSTFLAGS: '-C link-arg=-s'
         with:
           command: build
-          args: --manifest-path contracts/Cargo.toml --all --target wasm32-unknown-unknown
+          args: --manifest-path contracts/Cargo.toml --workspace --target wasm32-unknown-unknown
 
       - uses: actions-rs/cargo@v1
         with:
@@ -61,4 +61,4 @@ jobs:
         if: ${{ matrix.rust != 'nightly' }}
         with:
           command: clippy
-          args: --manifest-path contracts/Cargo.toml --all -- -D warnings
+          args: --manifest-path contracts/Cargo.toml --workspace -- -D warnings

.github/workflows/nightly_build.yml

@@ -42,13 +42,13 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: build
-          args: --all
+          args: --workspace
 
       - name: Run all tests
         uses: actions-rs/cargo@v1
         with:
           command: test
-          args: --all
+          args: --workspace
 
       - name: Check formatting
         uses: actions-rs/cargo@v1
@@ -81,13 +81,13 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: build
-          args: --all --features=coconut
+          args: --workspace --features=coconut
 
       - name: Run all tests with coconut enabled
         uses: actions-rs/cargo@v1
         with:
           command: test
-          args: --all --features=coconut
+          args: --workspace --features=coconut
 
       - name: Run clippy with coconut enabled
         uses: actions-rs/cargo@v1