chore(deps): upgrade to @babel@^7 for webpack 5 compatibility

BREAKING CHANGE: this slightly changes our browser compatibility list

.babelrc

@@ -1,9 +1,20 @@
+// .babelrc is an alias for .babelrc.json and uses JSON5 syntax
 {
     "plugins": [
-        "transform-async-to-generator",
-        "transform-object-rest-spread",
-        "transform-require-context",
-        "syntax-dynamic-import"
+        "@babel/plugin-transform-async-to-generator",
+        "@babel/plugin-transform-object-rest-spread",
+        "@babel/plugin-syntax-dynamic-import",
+        "transform-require-context"
     ],
-    "presets": ["es2015", "react"],
+    "presets": [
+        [
+            "@babel/preset-env",
+            {
+                // This papers over the fact that our current code is inconsistent
+                // For example, we sometimes use `import` with a file that exports with `module.exports`
+                "modules": "commonjs"
+            }
+        ],
+        "@babel/preset-react"
+    ]
 }

package.json

@@ -59,6 +59,13 @@
     "scratch-storage": "2.3.1"
   },
   "devDependencies": {
+    "@babel/cli": "7.23.4",
+    "@babel/core": "7.23.7",
+    "@babel/plugin-syntax-dynamic-import": "7.8.3",
+    "@babel/plugin-transform-async-to-generator": "7.23.3",
+    "@babel/plugin-transform-object-rest-spread": "7.23.4",
+    "@babel/preset-env": "7.23.8",
+    "@babel/preset-react": "7.23.3",
     "@formatjs/intl-datetimeformat": "6.4.3",
     "@formatjs/intl-locale": "3.0.11",
     "@formatjs/intl-numberformat": "8.3.3",
@@ -66,16 +73,9 @@
     "@formatjs/intl-relativetimeformat": "11.1.8",
     "async": "3.2.2",
     "autoprefixer": "10.4.2",
-    "babel-cli": "6.26.0",
-    "babel-core": "6.26.3",
     "babel-eslint": "10.1.0",
-    "babel-loader": "7.1.5",
-    "babel-plugin-syntax-dynamic-import": "^6.18.0",
-    "babel-plugin-transform-async-to-generator": "6.24.1",
-    "babel-plugin-transform-object-rest-spread": "6.26.0",
+    "babel-loader": "8.3.0",
     "babel-plugin-transform-require-context": "0.1.1",
-    "babel-preset-es2015": "6.24.1",
-    "babel-preset-react": "6.24.1",
     "bowser": "1.9.4",
     "canvas": "2.9.0",
     "chromedriver": "117.0.3",