fix(scripts): allow docs_update_experiments.sh to be run on macOS (#14658)

scripts/lib.sh

@@ -108,6 +108,13 @@ dependencies() {
 	for dep in "$@"; do
 		if ! dependency_check "$dep"; then
 			log "ERROR: The '$dep' dependency is required, but is not available."
+			if isdarwin; then
+				case "$dep" in
+				gsed | gawk)
+					log "- brew install $dep"
+					;;
+				esac
+			fi
 			fail=1
 		fi
 	done

scripts/release/docs_update_experiments.sh

@@ -12,6 +12,12 @@ set -euo pipefail
 source "$(dirname "${BASH_SOURCE[0]}")/../lib.sh"
 cdroot
 
+if isdarwin; then
+	dependencies gsed gawk
+	sed() { gsed "$@"; }
+	awk() { gawk "$@"; }
+fi
+
 # From install.sh
 echo_latest_stable_version() {
 	# https://gist.github.com/lukechilds/a83e1d7127b78fef38c2914c4ececc3c#gistcomment-2758860