Release 3.10.0 beta.3 (#345)

* chore: run go-generate

See https://github.com/ooni/probe/issues/1468

* chore: update all the dependencies

Unclear to me why `go get -u -v ./...` did not actually update
all of them and I needed to spell out each of them and force to
update by going `go get -u -v $pkg@latest` ¯\_(ツ)_/¯.

Part of https://github.com/ooni/probe/issues/1468

* fix(c/o/i/d/actions_test.go): ensure we check for return value

Part of https://github.com/ooni/probe/issues/1468

* chore: update the user agents we use

See https://github.com/ooni/probe/issues/1468

* chore: set version to 3.10.0-beta.3

See https://github.com/ooni/probe/issues/1468

* chore: use probe-assets v0.3.1

Part of https://github.com/ooni/probe/issues/1468

internal/engine/netx/gocertifi/certifi.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-04-26 14:35:17.585901576 +0200 CEST m=+1.233232011
+// 2021-05-12 09:14:54.779668278 +0200 CEST m=+6.872930413
 // https://curl.haxx.se/ca/cacert.pem
 
 package gocertifi
@@ -3227,7 +3227,7 @@ CAezNIm8BZ/3Hobui3A=
 `
 
 // CACerts builds an X.509 certificate pool containing the
-// certificate bundle from https://curl.haxx.se/ca/cacert.pem fetch on 2021-04-26 14:35:17.585901576 +0200 CEST m=+1.233232011.
+// certificate bundle from https://curl.haxx.se/ca/cacert.pem fetch on 2021-05-12 09:14:54.779668278 +0200 CEST m=+6.872930413.
 // Returns nil on error along with an appropriate error code.
 func CACerts() (*x509.CertPool, error) {
 	pool := x509.NewCertPool()