Add flatbuffers to libcudf build (#16446)

## Description
Without `flatbuffers` being added to the conda environment `libcudf` is
being built in is causing the following build failures:
```
In file included from /nvme/0/pgali/cudf/cpp/src/io/parquet/arrow_schema_writer.cpp:26:
/nvme/0/pgali/cudf/cpp/src/io/parquet/ipc/Message_generated.h:6:10: fatal error: flatbuffers/flatbuffers.h: No such file or directory
    6 | #include <flatbuffers/flatbuffers.h>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
```

## Checklist
- [x] I am familiar with the [Contributing
Guidelines](https://github.com/rapidsai/cudf/blob/HEAD/CONTRIBUTING.md).
- [ ] New or existing tests cover these changes.
- [x] The documentation is up to date with these changes.

conda/environments/all_cuda-118_arch-x86_64.yaml

@@ -30,6 +30,7 @@ dependencies:
 - dlpack>=0.8,<1.0
 - doxygen=1.9.1
 - fastavro>=0.22.9
+- flatbuffers==24.3.25
 - fmt>=10.1.1,<11
 - fsspec>=0.6.0
 - gcc_linux-64=11.*

conda/environments/all_cuda-125_arch-x86_64.yaml

@@ -31,6 +31,7 @@ dependencies:
 - dlpack>=0.8,<1.0
 - doxygen=1.9.1
 - fastavro>=0.22.9
+- flatbuffers==24.3.25
 - fmt>=10.1.1,<11
 - fsspec>=0.6.0
 - gcc_linux-64=11.*

conda/recipes/libcudf/conda_build_config.yaml

@@ -31,6 +31,9 @@ librdkafka_version:
 fmt_version:
   - ">=10.1.1,<11"
 
+flatbuffers_version:
+  - "=24.3.25"
+
 spdlog_version:
   - ">=1.12.0,<1.13"
 

conda/recipes/libcudf/meta.yaml

@@ -68,6 +68,7 @@ requirements:
     - dlpack {{ dlpack_version }}
     - librdkafka {{ librdkafka_version }}
     - fmt {{ fmt_version }}
+    - flatbuffers {{ flatbuffers_version }}
     - spdlog {{ spdlog_version }}
     - zlib {{ zlib_version }}
 

dependencies.yaml

@@ -287,6 +287,7 @@ dependencies:
       - output_types: conda
         packages:
           - fmt>=10.1.1,<11
+          - flatbuffers==24.3.25
           - librmm==24.8.*,>=0.0.0a0
           - libkvikio==24.8.*,>=0.0.0a0
           - librdkafka>=1.9.0,<1.10.0a0