Update package dependencies + tidy (#41)

Weekly update to the project's package dependencies initiated by an
automatic GitHub Action running on cron. Keeps upgrades less of a
monolithic task and lets security-related patches trickle in more
quickly.

Co-authored-by: Bot <bot@iandavis.com>

go.mod

@@ -2,4 +2,4 @@ module github.com/iand/microdata
 
 go 1.21.4
 
-require golang.org/x/net v0.21.0
+require golang.org/x/net v0.22.0

go.sum

@@ -1,2 +1,2 @@
-golang.org/x/net v0.21.0 h1:AQyQV4dYCvJ7vGmJyKki9+PBdyvhkSd8EIx/qb0AYv4=
-golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
+golang.org/x/net v0.22.0 h1:9sGLhx7iRIHEiX0oAJ3MRZMUCElJgy7Br1nO+AMN3Tc=
+golang.org/x/net v0.22.0/go.mod h1:JKghWKKOSdJwpW2GEx0Ja7fmaKnMsbu+MWVZTokSYmg=