Update to Go 1.20 + run better align (#2927)

* chore(go): update go version to 1.20. Closes #2185

* chore(go): run better align against project

To optimize struct field order. Closes #2870

* chore(go): update CI jobs to use Go 1.20

* fix(go): linter warnings for Go 1.20 update

models/playlist.go

@@ -2,16 +2,16 @@ package models
 
 // Segment represents a segment of the live stream.
 type Segment struct {
-	VariantIndex       int    // The bitrate variant
 	FullDiskPath       string // Where it lives on disk
 	RelativeUploadPath string // Path it should have remotely
 	RemoteURL          string
+	VariantIndex       int // The bitrate variant
 }
 
 // Variant represents a single video variant and the segments that make it up.
 type Variant struct {
-	VariantIndex int
 	Segments     map[string]*Segment
+	VariantIndex int
 }
 
 // GetSegmentForFilename gets the segment for the provided filename.