Fix failed CI job "Check buck targets and code format" (#11532)

Summary:
the first CI step "Check buck targets and code format..." is failing with the following error message:
```
Download action repository 'wei/wget@v1' (SHA:c15e476d1463f4936cb54f882170d9d631f1aba5)
Error: An action could not be found at the URI 'c15e476d14'
```
Not sure why the action is lost, but it seems we can use wget directly.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/11532

Test Plan: watch CI job "Check buck targets and code format"  passes

Reviewed By: ltamasi

Differential Revision: D46700626

Pulled By: cbi42

fbshipit-source-id: 53c09f27965444b533b3fe3755aec922571bba2c

.github/workflows/sanity_check.yml

@@ -33,9 +33,7 @@ jobs:
       run: pip install argparse
 
     - name: Download clang-format-diff.py
-      uses: wei/wget@v1
-      with:
-        args: https://raw.githubusercontent.com/llvm/llvm-project/release/12.x/clang/tools/clang-format/clang-format-diff.py
+      run: wget https://raw.githubusercontent.com/llvm/llvm-project/release/12.x/clang/tools/clang-format/clang-format-diff.py
 
     - name: Check format
       run: VERBOSE_CHECK=1 make check-format