Merge pull request diesel-rs#2981 from Binlogo/fix-doc-action

Update doc.yml: catchup & fix warning

Author: weiznich

.github/workflows/doc.yml

@@ -39,7 +39,7 @@ jobs:
       uses: actions-rs/cargo@v1
       with:
         command: doc
-        args: --manifest-path diesel/Cargo.toml --features "postgres sqlite mysql extras" --workspace --exclude=diesel_compile_tests
+        args: --manifest-path diesel/Cargo.toml --features "postgres sqlite mysql extras" --workspace
 
     - name: Publish documentation
       if: success()