Amazon SES: require boto3 with sesv2 support

Since Anymail dropped SES v1 support,
require at least boto3 v1.10.17
(which added the sesv2 client).

pyproject.toml

@@ -65,7 +65,7 @@ dependencies = [
 # ESP-specific additional dependencies.
 # (For simplicity, requests is included in the base dependencies.)
 # (Do not use underscores in extra names: they get normalized to hyphens.)
-amazon-ses = ["boto3"]
+amazon-ses = ["boto3>=1.10.17"]
 brevo = []
 mailersend = []
 mailgun = []