build(deps): bump formidable from 2.1.2 to 3.4.0 in /src

Bumps [formidable](https://github.com/node-formidable/formidable) from 2.1.2 to 3.4.0.
- [Release notes](https://github.com/node-formidable/formidable/releases)
- [Changelog](https://github.com/node-formidable/formidable/blob/master/CHANGELOG.md)
- [Commits](https://github.com/node-formidable/formidable/commits/v3.4.0)

---
updated-dependencies:
- dependency-name: formidable
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

src/package-lock.json

@@ -2782,6 +2782,20 @@
             "qs": "^6.10.3",
             "readable-stream": "^3.6.0",
             "semver": "^7.3.7"
+          },
+          "dependencies": {
+            "formidable": {
+              "version": "2.1.2",
+              "resolved": "https://registry.npmjs.org/formidable/-/formidable-2.1.2.tgz",
+              "integrity": "sha512-CM3GuJ57US06mlpQ47YcunuUZ9jpm8Vx+P2CGt2j7HpgkKZO/DJYQ0Bobim8G6PFQmK5lOqOOdUXboU+h73A4g==",
+              "dev": true,
+              "requires": {
+                "dezalgo": "^1.0.4",
+                "hexoid": "^1.0.0",
+                "once": "^1.4.0",
+                "qs": "^6.11.0"
+              }
+            }
           }
         }
       }
@@ -3059,14 +3073,13 @@
       }
     },
     "formidable": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/formidable/-/formidable-2.1.2.tgz",
-      "integrity": "sha512-CM3GuJ57US06mlpQ47YcunuUZ9jpm8Vx+P2CGt2j7HpgkKZO/DJYQ0Bobim8G6PFQmK5lOqOOdUXboU+h73A4g==",
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/formidable/-/formidable-3.4.0.tgz",
+      "integrity": "sha512-jVj65eK/bVBpImERgvY64oLf2yP7YKsyGj/u0P25k58G8B1SmpCLmAbh0Gld3J92M7J6oX5H1KnJJM8iDYiUtQ==",
       "requires": {
         "dezalgo": "^1.0.4",
         "hexoid": "^1.0.0",
-        "once": "^1.4.0",
-        "qs": "^6.11.0"
+        "once": "^1.4.0"
       }
     },
     "forwarded": {

src/package.json

@@ -42,7 +42,7 @@
     "express-session": "npm:@etherpad/express-session@^1.18.1",
     "fast-deep-equal": "^3.1.3",
     "find-root": "1.1.0",
-    "formidable": "^2.1.2",
+    "formidable": "^3.4.0",
     "http-errors": "^2.0.0",
     "js-cookie": "^3.0.5",
     "jsdom": "^19.0.0",