[8.11](backport #3564) [Automation] Bump Golang version to 1.20.9

[mergify]

This is an automatic backport of pull request #3564 done by Mergify.

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[elastic-sonarqube]

SonarQube Quality Gate

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-10-12T14:17:24.322+0000

• Duration: 55 min 29 sec

Test stats 🧪

Test	Results
Failed	0
Passed	6465
Skipped	59
Total	6524

💚 Flaky test report

Tests succeeded.

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	98.78% (81/82)	👍
Files	66.667% (198/297)	👍
Classes	65.461% (362/553)	👍
Methods	52.909% (1146/2166)	👍
Lines	38.445% (13058/33965)	👎 -0.012
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Pinging @elastic/elastic-agent (Team:Elastic-Agent)

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/8.11/pr-3564 upstream/mergify/bp/8.11/pr-3564
git merge upstream/8.11
git push upstream mergify/bp/8.11/pr-3564

[mergify]

This pull request has not been merged yet. Could you please review and merge it @apmmachine? 🙏

[cmacknz]

Closing we will go directly to 1.20.10.