Update gcc version for FBGEMM install in CI

Summary:
TorchRec CI currently is failing with issues on incompatible GLIBCXX version. The cause is that FBGEMM now requires g++ 11.1+ for building binaries that reference GLIBCXX_3.4.29 (as of pytorch/pytorch#141035)

As recommended in https://github.com/pytorch/FBGEMM/blob/main/.github/scripts/utils_build.bash and pytorch/FBGEMM#3423, install GCC using conda to control glibcxx version being used.

Differential Revision: D67607624

Author: sarckk

.github/workflows/docs.yml

@@ -33,7 +33,8 @@ jobs:
     - name: Setup conda
       run: |
         wget https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh -O ~/miniconda.sh
-        bash ~/miniconda.sh -b -p $HOME/miniconda
+        bash ~/miniconda.sh -b -p $HOME/miniconda -u
+        conda update -n base -c defaults -y conda
     - name: setup Path
       run: |
         echo "/home/ec2-user/miniconda/bin" >> $GITHUB_PATH
@@ -51,7 +52,14 @@ jobs:
     - name: Install gcc
       shell: bash
       run: |
-        sudo apt-get install build-essential
+        conda install -n build_binary -c conda-forge -y gxx_linux-64=11.4.0
+        echo "[INSTALL] Setting the C/C++ compiler symlinks ..."
+        local cc_path=$(conda run ${env_prefix} printenv CC)
+        local cxx_path=$(conda run ${env_prefix} printenv CXX)
+        ln -sf "${cc_path}" "$(dirname "$cc_path")/cc"
+        ln -sf "${cc_path}" "$(dirname "$cc_path")/gcc"
+        ln -sf "${cxx_path}" "$(dirname "$cxx_path")/c++"
+        ln -sf "${cxx_path}" "$(dirname "$cxx_path")/g++"
     - name: setup Path
       run: |
         echo /usr/local/bin >> $GITHUB_PATH