Hugo 0.67.1: A couple of Bug Fixes

Some minor fixes:

• metrics: Fix –templateMetricsHints 5eadc4c0 @bep #7048
• resources: Add data context to the key in ExecuteAsTemplate 18cb21ff @bep #7046
• Improve Tailwind/PostCSS error messages df298558 @bep #7041#7042
• deps: Update Blackfriday b1106f87 @bep #7039
• resources: Try to fix a Go 1.15 go vet error c0177fe2 @bep
• Add languageDirection to language configuration 5914f91b @le0tan #6550