ci: Add libcurl4-openssl-dev to dependencies

CURL is required but wasn't being installed via apt.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: mhaynie

.github/workflows/ccpp.yml

@@ -38,7 +38,7 @@ jobs:
     - name: Install compilers and tools
       run: |
         sudo apt-get update
-        sudo apt-get install -y ${{ matrix.compiler.deps }} ninja-build
+        sudo apt-get install -y ${{ matrix.compiler.deps }} ninja-build libcurl4-openssl-dev
         pip3 install gcovr
 
         echo "Ensuring programs work..."