build: upgrade Yarn to v4/berry

Following https://yarnpkg.com/migration/guide:

   yarn set version berry
   yarn install

.gitignore

@@ -51,8 +51,15 @@ typings/
 # Output of 'npm pack'
 *.tgz
 
-# Yarn Integrity file
-.yarn-integrity
+# Yarn
+# see https://yarnpkg.com/getting-started/qa#which-files-should-be-gitignored
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
 
 # dotenv environment variables file
 .env

.yarnrc.yml

@@ -0,0 +1 @@
+nodeLinker: node-modules

package.json

@@ -7,7 +7,7 @@
   "engines": {
     "node": ">=16"
   },
-  "packageManager": "yarn@1.22.21",
+  "packageManager": "yarn@4.1.1",
   "devDependencies": {
     "@jessie.js/eslint-plugin": "^0.3.0",
     "@octokit/core": "^3.4.0",

packages/bundle-source/package.json

@@ -4,9 +4,7 @@
   "description": "Create source bundles from ES Modules",
   "type": "module",
   "main": "src/index.js",
-  "bin": {
-    "bundle-source": "./src/tool.js"
-  },
+  "bin": "./src/tool.js",
   "exports": {
     ".": "./src/index.js",
     "./exported.js": "./exported.js",

packages/env-options/package.json

@@ -1,7 +1,6 @@
 {
   "name": "@endo/env-options",
   "version": "1.1.3",
-  "private": null,
   "description": "Reading environment options.",
   "keywords": [],
   "author": "Endo contributors",
@@ -18,7 +17,6 @@
   "type": "module",
   "main": "./index.js",
   "module": "./index.js",
-  "browser": null,
   "unpkg": null,
   "types": null,
   "exports": {

packages/memoize/package.json

@@ -1,7 +1,6 @@
 {
   "name": "@endo/memoize",
   "version": "1.1.1",
-  "private": null,
   "description": "Safe function memoization",
   "keywords": [],
   "author": "Endo contributors",
@@ -18,7 +17,6 @@
   "type": "module",
   "main": "./index.js",
   "module": "./index.js",
-  "browser": null,
   "unpkg": null,
   "types": null,
   "exports": {

packages/ses/package.json

@@ -97,7 +97,6 @@
     "tools.js",
     "src"
   ],
-  "private": false,
   "publishConfig": {
     "access": "public"
   },

packages/zip/package.json

@@ -56,7 +56,6 @@
     "*.js",
     "*.ts"
   ],
-  "private": false,
   "publishConfig": {
     "access": "public"
   },