build: fix path-to-regexp (#2108)

Sinon having dependency on the [nise package](https://www.npmjs.com/package/nise). That package just published v6.0.1 which updated path-to-regexp from v6.2.1 to v8.1.0 with https://github.com/sinonjs/nise/pull/226. That should have been a major version bump, as this ended up introducing a breaking change that now it depends on Node >= 16, which is causing our CI to break.

This PR fixes path-to-regexp to ^6.2.1 like previously to make it work on Node >= 14

.gitignore

@@ -12,3 +12,4 @@ system-test/*key.json
 .DS_Store
 package-lock.json
 __pycache__
+.vscode

package.json

@@ -115,8 +115,10 @@
     "mocha": "^9.2.2",
     "mv": "^2.1.1",
     "ncp": "^2.0.0",
+    "nise": "6.0.0",
     "@opentelemetry/sdk-trace-node": "^1.25.1",
     "p-limit": "^3.0.1",
+    "path-to-regexp": "6.2.2",
     "proxyquire": "^2.0.1",
     "sinon": "^18.0.0",
     "stats-lite": "^2.1.1",