go get -u ./...; go mod tidy

vendor/github.com/go-task/slim-sprig/v3/README.md

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+# Slim-Sprig: Template functions for Go templates [![Go Reference](https://pkg.go.dev/badge/github.com/go-task/slim-sprig/v3.svg)](https://pkg.go.dev/github.com/go-task/slim-sprig/v3)
+
+Slim-Sprig is a fork of [Sprig](https://github.com/Masterminds/sprig), but with
+all functions that depend on external (non standard library) or crypto packages
+removed.
+The reason for this is to make this library more lightweight. Most of these
+functions (specially crypto ones) are not needed on most apps, but costs a lot
+in terms of binary size and compilation time.
+
+## Usage
+
+**Template developers**: Please use Slim-Sprig's [function documentation](https://go-task.github.io/slim-sprig/) for
+detailed instructions and code snippets for the >100 template functions available.
+
+**Go developers**: If you'd like to include Slim-Sprig as a library in your program,
+our API documentation is available [at GoDoc.org](http://godoc.org/github.com/go-task/slim-sprig).
+
+For standard usage, read on.
+
+### Load the Slim-Sprig library
+
+To load the Slim-Sprig `FuncMap`:
+
+```go
+
+import (
+  "html/template"
+
+  "github.com/go-task/slim-sprig"
+)
+
+// This example illustrates that the FuncMap *must* be set before the
+// templates themselves are loaded.
+tpl := template.Must(
+  template.New("base").Funcs(sprig.FuncMap()).ParseGlob("*.html")
+)
+```
+
+### Calling the functions inside of templates
+
+By convention, all functions are lowercase. This seems to follow the Go
+idiom for template functions (as opposed to template methods, which are
+TitleCase). For example, this:
+
+```
+{{ "hello!" | upper | repeat 5 }}
+```
+
+produces this:
+
+```
+HELLO!HELLO!HELLO!HELLO!HELLO!
+```
+
+## Principles Driving Our Function Selection
+
+We followed these principles to decide which functions to add and how to implement them:
+
+- Use template functions to build layout. The following
+  types of operations are within the domain of template functions:
+  - Formatting
+  - Layout
+  - Simple type conversions
+  - Utilities that assist in handling common formatting and layout needs (e.g. arithmetic)
+- Template functions should not return errors unless there is no way to print
+  a sensible value. For example, converting a string to an integer should not
+  produce an error if conversion fails. Instead, it should display a default
+  value.
+- Simple math is necessary for grid layouts, pagers, and so on. Complex math
+  (anything other than arithmetic) should be done outside of templates.
+- Template functions only deal with the data passed into them. They never retrieve
+  data from a source.
+- Finally, do not override core Go template functions.