Fixed getaddrinfo tests failing

[agronholm]

Changes

Fixes sporadically failing test_getaddrinfo() due to external DNS issues.

Checklist

If this is a user-facing code change, like a bugfix or a new feature, please ensure that
you've fulfilled the following conditions (where applicable):

• You've added tests (in tests/) added which would fail without your patch
• You've updated the documentation (in docs/, in case of behavior changes or new
  features)
• You've added a new changelog entry (in docs/versionhistory.rst).

If this is a trivial change, like a typo fix or a code reformatting, then you can ignore
these instructions.

Updating the changelog

If there are no entries after the last release, use **UNRELEASED** as the version.
If, say, your patch fixes issue #123, the entry should look like this:

- Fix big bad boo-boo in task groups
  (`#123 <https://github.com/agronholm/anyio/issues/123>`_; PR by @yourgithubaccount)

If there's no issue linked, just link to your pull request instead by updating the
changelog after you've created the PR.

[Copilot]

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

.github/workflows/test.yml:97

• Appending host entries with tee -a may introduce duplicate lines on subsequent runs. Consider checking if the entry exists before adding to avoid potential conflicts.

echo "1.2.3.4 xn--fa-hia.de" | sudo tee -a /etc/hosts

[Copilot]

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

.github/workflows/test.yml:97

• [nitpick] Consider checking if the entry '1.2.3.4 xn--fa-hia.de' is already present before appending to /etc/hosts to avoid duplicate entries on repeated workflow runs.

echo "1.2.3.4 xn--fa-hia.de" | sudo tee -a /etc/hosts

[Copilot]

[nitpick] Consider checking if the entry '1.2.3.4 xn--fa-hia.de' is already present in the Windows hosts file before appending to prevent duplicate entries on repeated runs.

Suggested change

	Add-Content -Path C:\Windows\System32\drivers\etc\hosts -Value "1.2.3.4 xn--fa-hia.de"
	Add-Content -Path C:\Windows\System32\drivers\etc\hosts -Value "5.6.7.8 fass.de"
	if (-not (Select-String -Path C:\Windows\System32\drivers\etc\hosts -Pattern "1.2.3.4 xn--fa-hia.de")) {
	Add-Content -Path C:\Windows\System32\drivers\etc\hosts -Value "1.2.3.4 xn--fa-hia.de"
	}
	if (-not (Select-String -Path C:\Windows\System32\drivers\etc\hosts -Pattern "5.6.7.8 fass.de")) {
	Add-Content -Path C:\Windows\System32\drivers\etc\hosts -Value "5.6.7.8 fass.de"
	}