Update chroma (#18033)

Update chroma to 0.9.4

Signed-off-by: Andrew Thornton <art27@cantab.net>

vendor/github.com/alecthomas/chroma/lexers/b/bashsession.go

@@ -0,0 +1,27 @@
+package b
+
+import (
+	. "github.com/alecthomas/chroma" // nolint
+	"github.com/alecthomas/chroma/lexers/internal"
+)
+
+// BashSession lexer.
+var BashSession = internal.Register(MustNewLazyLexer(
+	&Config{
+		Name:      "BashSession",
+		Aliases:   []string{"bash-session", "console", "shell-session"},
+		Filenames: []string{".sh-session"},
+		MimeTypes: []string{"text/x-sh"},
+		EnsureNL:  true,
+	},
+	bashsessionRules,
+))
+
+func bashsessionRules() Rules {
+	return Rules{
+		"root": {
+			{`(^[#$%>]\s*)(.*\n?)`, ByGroups(GenericPrompt, Using(Bash)), nil},
+			{`^.+\n?`, GenericOutput, nil},
+		},
+	}
+}