Bump the runner images & fix the CI

[sirknightj]

Issue #, if available:

• N/A

What was changed?

• Bump the runner images in the GitHub actions configuration file.
• Building with LWS, it was previously working fine on Clang 11. Encountered build issues with the LWS version (3.2.3) on Clang 14, so disable WERROR on the dependency. The GitHub Ubuntu 20 runner (with CC=clang) uses Clang 11 by default, but the latest uses Clang 14 by default.

[  8%] Building C object CMakeFiles/websockets_shared.dir/lib/core/libwebsockets.c.o
[ 10%] Building C object CMakeFiles/websockets_shared.dir/lib/core/logs.c.o
[ 11%] Building C object CMakeFiles/websockets_shared.dir/lib/misc/base64-decode.c.o
/home/runner/work/amazon-kinesis-video-streams-producer-c/amazon-kinesis-video-streams-producer-c/open-source/libwebsockets/build/src/project_libwebsockets/lib/misc/base64-decode.c:58:6: error: variable 'line' set but not used [-Werror,-Wunused-but-set-variable]
        int line = 0;
            ^
1 error generated.
gmake[5]: *** [CMakeFiles/websockets_shared.dir/build.make:163: CMakeFiles/websockets_shared.dir/lib/misc/base64-decode.c.o] Error 1
gmake[4]: *** [CMakeFiles/Makefile2:90: CMakeFiles/websockets_shared.dir/all] Error 2
gmake[3]: *** [Makefile:156: all] Error 2
gmake[2]: *** [CMakeFiles/project_libwebsockets.dir/build.make:87: build/src/project_libwebsockets-stamp/project_libwebsockets-build] Error 2
gmake[1]: *** [CMakeFiles/Makefile2:87: CMakeFiles/project_libwebsockets.dir/all] Error 2
gmake: *** [Makefile:91: all] Error 2
CMake Error at CMake/Utilities.cmake:93 (message):
  CMake step for libwebsockets failed: 2
Call Stack (most recent call first):
  CMakeLists.txt:109 (build_dependency)


-- Configuring incomplete, errors occurred!

Why was it changed?

• macos-12 is deprecated
• Ubuntu 20 will be deprecated sometime in 2025. https://ubuntu.com/about/release-cycle

How was it changed?

• See the files changed tab to see which configuration lines were changed.

What testing was done for the changes?

• CI should pass.
• Since only the CI was updated, testing on GitHub actions is sufficient.

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