[7.x](backport #26380) Update urllib to 1.26.5.

[mergify]

This is an automatic backport of pull request #26380 done by Mergify.
Cherry-pick of 2f873a2 has failed:

On branch mergify/bp/7.x/pr-26380
Your branch is up to date with 'origin/7.x'.

You are currently cherry-picking commit 2f873a234.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   libbeat/tests/system/requirements.txt

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   metricbeat/module/kubernetes/_meta/terraform/eks/requirements.txt

To fix up this pull request, you can check it out locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

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[elasticmachine]

💚 Build Succeeded

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Build stats

• Build Cause: Pull request #26578 updated

• Start Time: 2021-06-30T08:09:11.801+0000

• Duration: 140 min 9 sec

• Commit: 83d314f

Test stats 🧪

Test	Results
Failed	0
Passed	47866
Skipped	5290
Total	53156

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💚 Flaky test report

Tests succeeded.

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Test stats 🧪

Test	Results
Failed	0
Passed	47866
Skipped	5290
Total	53156

[jsoriano]

/test