Fix upstream Go templates bug with reversed key/value assignment

The template packages are based on go1.20.5 with the patch in befec5ddbbfbd81ec84e74e15a38044d67f8785b  added.

This also includes a security fix that now disallows Go template actions in JS literals (inside backticks).

This will throw an error saying "... appears in a JS template literal".

If you're really sure this isn't a security risk in your case, you can revert to the old behaviour:

```toml
[security]
[security.gotemplates]
allowActionJSTmpl = true
```

See https://github.com/golang/go/issues/59234

Fixes #11112

tpl/internal/go_templates/htmltemplate/js.go

@@ -14,6 +14,11 @@ import (
 	"unicode/utf8"
 )
 
+// jsWhitespace contains all of the JS whitespace characters, as defined
+// by the \s character class.
+// See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Character_classes.
+const jsWhitespace = "\f\n\r\t\v\u0020\u00a0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u2028\u2029\u202f\u205f\u3000\ufeff"
+
 // nextJSCtx returns the context that determines whether a slash after the
 // given run of tokens starts a regular expression instead of a division
 // operator: / or /=.
@@ -27,7 +32,8 @@ import (
 // JavaScript 2.0 lexical grammar and requires one token of lookbehind:
 // https://www.mozilla.org/js/language/js20-2000-07/rationale/syntax.html
 func nextJSCtx(s []byte, preceding jsCtx) jsCtx {
-	s = bytes.TrimRight(s, "\t\n\f\r \u2028\u2029")
+	// Trim all JS whitespace characters
+	s = bytes.TrimRight(s, jsWhitespace)
 	if len(s) == 0 {
 		return preceding
 	}
@@ -309,6 +315,7 @@ var jsStrReplacementTable = []string{
 	// Encode HTML specials as hex so the output can be embedded
 	// in HTML attributes without further encoding.
 	'"':  `\u0022`,
+	'`':  `\u0060`,
 	'&':  `\u0026`,
 	'\'': `\u0027`,
 	'+':  `\u002b`,
@@ -332,6 +339,7 @@ var jsStrNormReplacementTable = []string{
 	'"':  `\u0022`,
 	'&':  `\u0026`,
 	'\'': `\u0027`,
+	'`':  `\u0060`,
 	'+':  `\u002b`,
 	'/':  `\/`,
 	'<':  `\u003c`,