ci: Use Go 1.19 and update GH actions (#58)

This updates sally to build and test against Go 1.19.

Additionally, this upgrades the GitHub Action versions
for checkout and setup-go.
One of the features in setup-go v3 is that caching is built-in
and opted-into with `cache: true`.

Non-CI changes: gofmt, drop ioutil

1 files changed, 2 insertions, 2 deletions

diff --git a/config.go b/config.go
index e322da3..2588f39 100644
--- a/config.go
+++ b/config.go
@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 	"sort"
 	"strings"
 
@@ -55,7 +55,7 @@ func ensureAlphabetical(data []byte) bool {
 func Parse(path string) (*Config, error) {
 	var c Config
 
-	data, err := ioutil.ReadFile(path)
+	data, err := os.ReadFile(path)
 	if err != nil {
 		return nil, err
 	}