fix(userspace/libsinsp): solve segfault when formatting string views #4900

Job	Run time
build-libs-emscripten 🧐	3m 49s
build-libs-linux-amd64-asan 🧐	8m 21s
build-libs-linux-amd64 😁 (system_deps)	5m 15s
build-libs-linux-amd64-static 🎃	22m 8s
build-libs-linux-amd64 😁 (bundled_deps)	16m 53s
build-libs-others-amd64 😨 (windows-latest)	9m 15s
build-shared-libs-linux-amd64 🧐	3m 44s
build-libs-linux-amd64 😁 (system_deps_w_chisels)	5m 22s
build-libs-others-amd64 😨 (macos-latest)	13m 43s
build-shared-libs-macos-amd64 😨	4m 5s
build-libs-linux-amd64 😁 (system_deps_minimal)	3m 45s
build-libs-linux-arm64 😁 (system_deps)	5m 46s
run-e2e-tests-amd64 (system_deps)	8m 38s
test-libs-static (bundled_deps)	14m 47s
build-libs-linux-arm64 😁 (bundled_deps)	6h 0m 0s
build-libs-linux-arm64 😁 (system_deps_w_chisels)	5m 48s
build-libs-linux-arm64 😁 (system_deps_minimal)	4m 4s
run-e2e-tests-amd64 (bundled_deps)	19m 54s
run-e2e-tests-amd64 (system_deps_w_chisels)	8m 41s
run-e2e-tests-amd64 (asan)	21m 40s
	9h 5m 38s

Provide feedback