VSCode uses old dependecy that doesn't support XDG basedir specification

VSCode appear to be using an old version of NSS (Network Security Services) that clutters `$HOME` with a `.pki` folder.
It should have been fixed in [NSS 3.42](https://firefox-source-docs.mozilla.org/security/nss/legacy/nss_releases/nss_3.42_release_notes/index.html) (see: https://bugzilla.mozilla.org/show_bug.cgi?id=818686)

Any way to prevent this from happening? Is it possible to use a newer version of the library?

No file, test, or entry point is named. Start by reading the linked NSS 3.42 release notes and Bugzilla issue 818686, then inspect the Flatpak packaging to identify the NSS version used by VSCode. Done means confirming whether a newer NSS can be used and preventing the .pki directory from being created in $HOME.

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