Fixes #1212 - by force updating and upgrading the nghttp2-libs package

[dasrecht]

Checklist

• Affected Issues have been mentioned in the Closing issues section
• Documentation has been written/updated.
• Changelog entry has been written

Explain the details for making this change. What existing problem does the pull request solve?

Changelog Entry

Bugfix - Update nghttp2-libs

Closing issues

Fixes #1212

[dasrecht]

> docker run -it php:7.2-fpm-alpine apk list | grep nghttp
nghttp2-libs-1.38.0-r0 x86_64 {nghttp2} (MIT) [installed]
> docker run -it lagoon/php:7.2-cli apk list | grep nghttp
nghttp2-libs-1.39.2-r0 x86_64 {nghttp2} (MIT) [installed]

Built the image locally and the update seems to land the newest nghttp2 library