replace sprig (unmaintained) with go-sprout/sprout (replacement) (#5384)

README.md

@@ -2359,7 +2359,7 @@ _Libraries and tools for templating and lexing._
 - [raymond](https://github.com/aymerick/raymond) - Complete handlebars implementation in Go.
 - [Razor](https://github.com/sipin/gorazor) - Razor view engine for Golang.
 - [Soy](https://github.com/robfig/soy) - Closure templates (aka Soy templates) for Go, following the [official spec](https://developers.google.com/closure/templates/).
-- [sprig](https://github.com/Masterminds/sprig) - Useful template functions for Go templates.
+- [sprout](https://github.com/go-sprout/sprout) - Useful template functions for Go templates.
 - [tbd](https://github.com/lucasepe/tbd) - A really simple way to create text templates with placeholders - exposes extra builtin Git repo metadata.
 - [templ](https://github.com/a-h/templ) - A HTML templating language that has great developer tooling.