workflows/release-tasks: Always run apt-get update before installing deps

There is a bug in the package tree of on the default images that
causes some dependencies not to be found.  Running apt-get gets us
the latest package lists rather than relying on the default lists
in the GitHub Runner imgae, which can be up to a week old.

Running apt-get update before intstalling packages is also recommended in
the official github documentation:

https://docs.github.com/en/actions/using-github-hosted-runners/customizing-github-hosted-runners#installing-software-on-ubuntu-runners

Reviewed By: thieta

Differential Revision: https://reviews.llvm.org/D148741

(cherry picked from commit 93d6289)

Author: tstellar

.github/workflows/release-tasks.yml

@@ -22,6 +22,7 @@ jobs:
 
     - name: Install Dependencies
       run: |
+        sudo apt-get update \
         sudo apt-get install -y \
             doxygen \
             graphviz \