[whatwg/fetch] Add port blocking for tftp, netbios-ns, snmp, rtsp, h323gatestat, h32… (#1148)

…3hostcall, pptp, sane-port

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- [x] At least two implementers are interested (and none opposed):
   * [blink intent to ship](https://groups.google.com/a/chromium.org/g/blink-dev/c/4Btz5xQ-gXc/m/iPDxYSEgAgAJ)
   * [Firefox](https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/#CVE-2021-23961)
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * upcoming
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chrome: …
   * Firefox: …
   * Safari: …

(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1148


-- Commit Summary --

  * Add port blocking for tftp, netbios-ns, snmp, rtsp, h323gatestat, h323hostcall, pptp, sane-port

-- File Changes --

    M fetch.bs (8)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1148.patch

https://github.com/whatwg/fetch/pull/1148.diff


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