Hugo 0.59.1: A couple of Bug Fixes

This is a bug-fix release with a couple of important fixes.

• hugofs: Fix crash in multilingual content fs 33c474b9 @bep #6463
• Dockerfile: Switch to mage builds, various optimizations ed268232 @jakejarvis
• resources/images: Add exception for new test image 66fe68ff @anthonyfok #6439
• Adjust benchmark templates c5e1e824 @bep
• deps: Update to Chroma v0.6.8 to fix a crash baa97508 @bep #6450
• deps: Update quicktest 3e8b5a5c @bep
• Do not attempt to build if there is no config file e6aa6edb @ollien #5896