Fix "pry" warning (#11530)

Gemfile.lock

@@ -89,7 +89,7 @@ GEM
     climate_control (0.2.0)
     codecov (0.6.0)
       simplecov (>= 0.15, < 0.22)
-    coderay (1.1.2)
+    coderay (1.1.3)
     coffee-rails (5.0.0)
       coffee-script (>= 2.2.0)
       railties (>= 5.2.0)
@@ -331,7 +331,7 @@ GEM
     memoist (0.16.2)
     memoizable (0.4.2)
       thread_safe (~> 0.3, >= 0.3.1)
-    method_source (0.9.2)
+    method_source (1.0.0)
     mime-types (3.4.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2022.0105)
@@ -413,9 +413,9 @@ GEM
     phantomjs (2.1.1.0)
     php-serialize (1.3.0)
     power_assert (2.0.1)
-    pry (0.12.2)
-      coderay (~> 1.1.0)
-      method_source (~> 0.9.0)
+    pry (0.14.1)
+      coderay (~> 1.1)
+      method_source (~> 1.0)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (5.0.0)
@@ -798,4 +798,4 @@ RUBY VERSION
    ruby 2.7.3p183
 
 BUNDLED WITH
-   2.3.16
+   2.3.24

package.json

@@ -65,10 +65,12 @@
     "tocbot": "^4.18.2",
     "typeahead.js": "^0.11.1",
     "typeahead.js-browserify": "Javier-Rotelli/typeahead.js-browserify#~1.0.7",
-    "urlhash": "^0.1.3"
+    "urlhash": "^0.1.3",
+    "webpack": "^4.46.0",
+    "webpack-cli": "^3.3.12"
   },
   "devDependencies": {
-    "webpack-dev-server": "^4.11.0"
+    "webpack-dev-server": "^3"
   },
   "homepage": "https://github.com/publiclab/plots2",
   "engines": {