Bump ms and debug in /generator-exercise

Bumps [ms](https://github.com/vercel/ms) and [debug](https://github.com/debug-js/debug). These dependencies needed to be updated together.

Updates `ms` from 0.7.1 to 2.0.0
- [Release notes](https://github.com/vercel/ms/releases)
- [Commits](https://github.com/vercel/ms/compare/0.7.1...2.0.0)

Updates `debug` from 2.2.0 to 2.6.9
- [Release notes](https://github.com/debug-js/debug/releases)
- [Changelog](https://github.com/debug-js/debug/blob/2.6.9/CHANGELOG.md)
- [Commits](https://github.com/debug-js/debug/compare/2.2.0...2.6.9)

---
updated-dependencies:
- dependency-name: ms
  dependency-type: indirect
- dependency-name: debug
  dependency-type: indirect
...

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

generator-exercise/package-lock.json

@@ -727,9 +727,9 @@
       "integrity": "sha1-J0Pjq7XD/CRi5SfcpEXgTp9N7hc="
     },
     "debug": {
-      "version": "2.6.8",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.8.tgz",
-      "integrity": "sha1-5zFTHKLt4n0YgiJCfaF4IdaP9Pw=",
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
       "requires": {
         "ms": "2.0.0"
       }
@@ -3441,23 +3441,6 @@
                 }
               }
             },
-            "debug": {
-              "version": "2.2.0",
-              "resolved": "https://registry.npmjs.org/debug/-/debug-2.2.0.tgz",
-              "integrity": "sha1-+HBX6ZWxofauaklgZkE3vFbwOdo=",
-              "dev": true,
-              "requires": {
-                "ms": "0.7.1"
-              },
-              "dependencies": {
-                "ms": {
-                  "version": "0.7.1",
-                  "resolved": "https://registry.npmjs.org/ms/-/ms-0.7.1.tgz",
-                  "integrity": "sha1-nNE8A62/8ltl7/3nzoZO6VIBcJg=",
-                  "dev": true
-                }
-              }
-            },
             "extend": {
               "version": "3.0.0",
               "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.0.tgz",
@@ -3581,23 +3564,6 @@
               "integrity": "sha1-aUMcfLWvcjd0sNORG0w3USQxkQ8=",
               "dev": true
             },
-            "debug": {
-              "version": "2.2.0",
-              "resolved": "https://registry.npmjs.org/debug/-/debug-2.2.0.tgz",
-              "integrity": "sha1-+HBX6ZWxofauaklgZkE3vFbwOdo=",
-              "dev": true,
-              "requires": {
-                "ms": "0.7.1"
-              },
-              "dependencies": {
-                "ms": {
-                  "version": "0.7.1",
-                  "resolved": "https://registry.npmjs.org/ms/-/ms-0.7.1.tgz",
-                  "integrity": "sha1-nNE8A62/8ltl7/3nzoZO6VIBcJg=",
-                  "dev": true
-                }
-              }
-            },
             "minimist": {
               "version": "1.2.0",
               "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",