ci: Remove mentions of non-existant matrix variables

.github/workflows/appservice.yml

@@ -43,7 +43,6 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           toolchain: ${{ matrix.rust || 'stable' }}
-          target: ${{ matrix.target }}
           profile: minimal
           override: true
 

.github/workflows/ci.yml

@@ -83,7 +83,7 @@ jobs:
     name: ${{ matrix.name }}
     if: github.event_name == 'push' || !github.event.pull_request.draft
 
-    runs-on: ${{ matrix.os || 'ubuntu-latest' }}
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: true
       matrix:
@@ -129,8 +129,7 @@ jobs:
       - name: Install Rust
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: ${{ matrix.rust || 'stable' }}
-          target: ${{ matrix.target }}
+          toolchain: stable
           profile: minimal
           override: true
 
@@ -173,7 +172,6 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           toolchain: ${{ matrix.rust || 'stable' }}
-          target: ${{ matrix.target }}
           profile: minimal
           override: true
 

.github/workflows/wasm.yml

@@ -65,7 +65,7 @@ jobs:
     - name: Install emscripten
       uses: mymindstorm/setup-emsdk@v11
       with:
-        version: ${{ matrix.emcc_version || 'latest'  }}
+        version: latest
 
     - name: check
       uses: actions-rs/cargo@v1