Update tested buildozer

.github/workflows/ci.yaml

@@ -44,7 +44,7 @@ jobs:
     steps:
       - run: |
           mkdir --parents /tmp/bin
-          wget --no-verbose https://github.com/bazelbuild/buildtools/releases/download/v6.1.2/buildozer-linux-amd64 -O /tmp/bin/buildozer
+          wget --no-verbose https://github.com/bazelbuild/buildtools/releases/download/v6.4.0/buildozer-linux-amd64 -O /tmp/bin/buildozer
           chmod +x /tmp/bin/buildozer
       - uses: actions/checkout@v4
       - name: Integration tests - Applying fixes

README.md

@@ -249,7 +249,7 @@ Even if analysing the code works initially, it might break at any time if the or
 | Operating system | No constraints by design. However, Ubuntu 22.04 is currently the only OS used for development and testing. |
 | Python           | Minimum version is 3.8. All newer major versions until 3.12 are tested.                                    |
 | Bazel            | Minimum version is 5.4.0. Multiple newer versions are tested including rolling releases.                   |
-| Buildozer        | No known limitations. Tests have been performed with 5.0.1.                                                |
+| Buildozer        | No known limitations. Tests are performed with 6.4.0.                                                      |
 
 # Alternatives to DWYU