feat: rename progressData.externalsMap to progressData.externals

BREAKING CHANGE:
progressData.externalsMap was renamed to progressData.externals

lib/private/create-progress-data.js

@@ -2,4 +2,4 @@
 
 const ee = require("event-emitter");
 
-module.exports = () => ee({ done: new Set(), ongoing: new Map(), externalsMap: new Map() });
+module.exports = () => ee({ done: new Set(), ongoing: new Map(), externals: new Map() });

lib/private/setup-dependencies/setup-dependency/npm-link-dependency/resolve-external-context.js

@@ -37,16 +37,16 @@ const getLatestSupportedVersion = async ({ dependentContext, name, versionRange
 
 module.exports = async (dependencyContext, progressData) => {
 	const { name } = dependencyContext;
-	const { externalsMap } = progressData;
-	if (!externalsMap.has(name)) {
+	const { externals } = progressData;
+	if (!externals.has(name)) {
 		const metadata = await getMetadata(name);
-		externalsMap.set(name, {
+		externals.set(name, {
 			currentLinkVersion: await getCurrentLinkVersion(dependencyContext),
 			latestVersion: metadata["dist-tags"].latest,
 			metadata
 		});
-		log.debug("resolved %s (external dependency) meta %o", name, externalsMap.get(name));
+		log.debug("resolved %s (external dependency) meta %o", name, externals.get(name));
 	}
-	dependencyContext.externalContext = externalsMap.get(name);
+	dependencyContext.externalContext = externals.get(name);
 	dependencyContext.latestSupportedVersion = await getLatestSupportedVersion(dependencyContext);
 };