Fix `upload-sarif` Action failing if there are no Code Scanning SARIF files #5711

Job	Run time
Go: tracing with custom build steps (ubuntu-latest, stable-v2.18.4)	1m 20s
Go: tracing with custom build steps (macos-latest, stable-v2.19.4)	2m 45s
Go: tracing with custom build steps (macos-latest, stable-v2.18.4)	3m 3s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.21.4)	1m 11s
Go: tracing with custom build steps (macos-latest, stable-v2.22.4)	2m 36s
Go: tracing with custom build steps (ubuntu-latest, linked)	1m 6s
Go: tracing with custom build steps (macos-latest, stable-v2.21.4)	2m 38s
Go: tracing with custom build steps (ubuntu-latest, default)	1m 6s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.22.4)	1m 7s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.17.6)	1m 32s
Go: tracing with custom build steps (macos-latest, default)	2m 22s
Go: tracing with custom build steps (macos-latest, stable-v2.20.7)	2m 10s
Go: tracing with custom build steps (macos-latest, linked)	2m 49s
Go: tracing with custom build steps (macos-latest, nightly-latest)	2m 40s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.20.7)	1m 5s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.19.4)	1m 14s
Go: tracing with custom build steps (ubuntu-latest, nightly-latest)	50s
Go: tracing with custom build steps (macos-latest, stable-v2.17.6)	2m 23s
	33m 57s

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