Bump to actions/upload-artifact@v4 to make github happy #275

Job	Run time
Build and test g++-10 -	4m 42s
Build and test g++-11 -	4m 37s
Build and test g++-12 -	5m 11s
Build and test clang++-14 -	4m 49s
Build and test g++-10 - -DPBRT_DBG_LOGGING=True	3m 38s
Build and test g++-11 - -DPBRT_DBG_LOGGING=True	3m 22s
Build and test g++-12 - -DPBRT_DBG_LOGGING=True	4m 23s
Build and test clang++-14 - -DPBRT_DBG_LOGGING=True	4m 10s
Build and test g++-10 - -DPBRT_FLOAT_AS_DOUBLE=True	3m 44s
Build and test g++-11 - -DPBRT_FLOAT_AS_DOUBLE=True	4m 7s
Build and test g++-12 - -DPBRT_FLOAT_AS_DOUBLE=True	3m 53s
Build and test clang++-14 - -DPBRT_FLOAT_AS_DOUBLE=True	3m 52s
	50m 28s

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