chore(deps): update actions/upload-artifact digest to b4b15b8 #175

Job	Run time
BuildFuzzers	10m 6s
RunFuzzers (curl_fuzzer_bufq)	2m 59s
RunFuzzers (curl_fuzzer_dict)	2m 37s
RunFuzzers (curl_fuzzer_file)	3m 3s
RunFuzzers (curl_fuzzer_ftp)	2m 59s
RunFuzzers (curl_fuzzer_gopher)	2m 58s
RunFuzzers (curl_fuzzer_http)	3m 5s
RunFuzzers (curl_fuzzer_https)	3m 7s
RunFuzzers (curl_fuzzer_imap)	3m 6s
RunFuzzers (curl_fuzzer_mqtt)	2m 59s
RunFuzzers (curl_fuzzer_pop3)	2m 59s
RunFuzzers (curl_fuzzer_rtsp)	3m 9s
RunFuzzers (curl_fuzzer_smb)	2m 59s
RunFuzzers (curl_fuzzer_smtp)	2m 58s
RunFuzzers (curl_fuzzer_tftp)	2m 57s
RunFuzzers (curl_fuzzer_ws)	3m 0s
RunFuzzers (curl_fuzzer)	2m 58s
RunFuzzers (fuzz_url)	2m 57s
	1h 0m 56s

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