Update .buildkite/build_benchmark.sh

Co-authored-by: Elliot Saba <[email protected]>

.buildkite/build_benchmark.sh

@@ -22,7 +22,7 @@ if [[ "${OPENMODELICA_BENCHMARK_TARGETS[*]}" =~ "${1}" ]]; then
 	apt-get install --yes ca-certificates curl gnupg
 	curl -fsSL http://build.openmodelica.org/apt/openmodelica.asc | gpg --dearmor -o /usr/share/keyrings/openmodelica-keyring.gpg
 
-	echo "deb [arch=arm64 signed-by=/usr/share/keyrings/openmodelica-keyring.gpg] https://build.openmodelica.org/apt \
+	echo "deb [arch=amd64 signed-by=/usr/share/keyrings/openmodelica-keyring.gpg] https://build.openmodelica.org/apt \
   		$(cat /etc/os-release | grep "\(UBUNTU\\|DEBIAN\\|VERSION\)_CODENAME" | sort | cut -d= -f 2 | head -1) stable" \
 		| tee /etc/apt/sources.list.d/openmodelica.list