fix(webapp): upgrade posthog-node to v5, drop axios + stale override

Author: nicktrn

.server-changes/bump-posthog-node-v5.md

@@ -0,0 +1,6 @@
+---
+area: webapp
+type: fix
+---
+
+Upgrade posthog-node to v5 (drops its axios dependency) and remove the now-stale axios override so axios resolves to patched 1.16.1

apps/webapp/package.json

@@ -183,7 +183,7 @@
     "p-retry": "^4.6.1",
     "parse-duration": "^2.1.0",
     "posthog-js": "^1.93.3",
-    "posthog-node": "4.17.1",
+    "posthog-node": "5.35.6",
     "prism-react-renderer": "^2.3.1",
     "prismjs": "^1.30.0",
     "prom-client": "^15.1.0",

package.json

@@ -96,7 +96,6 @@
       "form-data@^2": "2.5.4",
       "form-data@^3": "3.0.4",
       "form-data@^4": "4.0.4",
-      "axios@>=1.0.0 <1.15.0": "^1.15.0",
       "js-yaml@>=3.0.0 <3.14.2": "3.14.2",
       "js-yaml@>=4.0.0 <4.1.1": "4.1.1",
       "jws@<3.2.3": "3.2.3",