Pin bazel and dev dependencies

Before I was able to build I had to make these changes:

1. add a `.bazelversion` to pin bazel

```
7.6.1
```

2. pin the google abseil version in `WORKSPACE`

```
http_archive(
name = "com_google_absl",
strip_prefix = "abseil-cpp-20230125.3",
urls = ["https://github.com/abseil/abseil-cpp/archive/refs/tags/20230125.3.zip"],
)
```

3. disable bzlmod in `.bazelrc`

```
common --enable_bzlmod=false
common --enable_workspace=true
```