Release: update user-agent, bundled CA, version number (#281)

* chore: update the user-agent we use

Part of the check-list at https://github.com/ooni/probe/issues/1369.

* chore: set version to 3.9.0

See https://github.com/ooni/probe/issues/1369

* chore: run go generate ./...

This is meant to update the bundled CA. We have heard of issues with
our bundled CA, but it seems there have been no changes upstream.

The website https://curl.se/docs/caextract.html still lists as the
last change the one done on Jan 19, 2021, which is the version of
the CA that we're currently bundling.

For the sake of continuing with the release process, I am going
to further investigate the CA once the release is done.

This chore is part of https://github.com/ooni/probe/issues/1369.

internal/engine/ooapi/apis.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-03-10 13:17:31.904167818 +0100 CET m=+0.000077877
+// 2021-03-31 16:50:03.708459546 +0200 CEST m=+0.000228783
 
 package ooapi
 

internal/engine/ooapi/apis_test.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-03-10 13:17:32.206416809 +0100 CET m=+0.000074280
+// 2021-03-31 16:50:04.057051721 +0200 CEST m=+0.000093878
 
 package ooapi
 

internal/engine/ooapi/caching.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-03-10 13:17:32.455000394 +0100 CET m=+0.000119352
+// 2021-03-31 16:50:04.317557242 +0200 CEST m=+0.000161626
 
 package ooapi
 

internal/engine/ooapi/caching_test.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-03-10 13:17:32.727159555 +0100 CET m=+0.000080664
+// 2021-03-31 16:50:04.580341787 +0200 CEST m=+0.000148802
 
 package ooapi
 

internal/engine/ooapi/callers.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-03-10 13:17:32.990745473 +0100 CET m=+0.000093232
+// 2021-03-31 16:50:04.79291318 +0200 CEST m=+0.000077728
 
 package ooapi
 

internal/engine/ooapi/clientcall.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-03-10 13:17:33.307415377 +0100 CET m=+0.000150212
+// 2021-03-31 16:50:05.02947443 +0200 CEST m=+0.000143471
 
 package ooapi
 

internal/engine/ooapi/clientcall_test.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-03-10 13:17:33.590560357 +0100 CET m=+0.000145982
+// 2021-03-31 16:50:05.248051533 +0200 CEST m=+0.000086484
 
 package ooapi
 

internal/engine/ooapi/cloners.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-03-10 13:17:33.849313529 +0100 CET m=+0.000136772
+// 2021-03-31 16:50:05.487854795 +0200 CEST m=+0.000140777
 
 package ooapi
 

internal/engine/ooapi/fakeapi_test.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-03-10 13:17:34.086220417 +0100 CET m=+0.000080714
+// 2021-03-31 16:50:05.702711633 +0200 CEST m=+0.000209246
 
 package ooapi
 

internal/engine/ooapi/login.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-03-10 13:17:34.342751918 +0100 CET m=+0.000196026
+// 2021-03-31 16:50:05.963781069 +0200 CEST m=+0.000149834
 
 package ooapi
 

internal/engine/ooapi/login_test.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-03-10 13:17:34.605701732 +0100 CET m=+0.000131680
+// 2021-03-31 16:50:06.223242139 +0200 CEST m=+0.000161967
 
 package ooapi
 

internal/engine/ooapi/requests.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-03-10 13:17:35.068399906 +0100 CET m=+0.000095438
+// 2021-03-31 16:50:06.482208133 +0200 CEST m=+0.000110650
 
 package ooapi
 

internal/engine/ooapi/responses.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-03-10 13:17:35.43791782 +0100 CET m=+0.000136842
+// 2021-03-31 16:50:06.785000911 +0200 CEST m=+0.000179961
 
 package ooapi
 

internal/engine/ooapi/swagger_test.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-03-10 13:17:35.72281221 +0100 CET m=+0.000577472
+// 2021-03-31 16:50:07.052341608 +0200 CEST m=+0.000586077
 
 package ooapi
 
@@ -9,7 +9,7 @@ const swagger = `{
     "swagger": "2.0",
     "info": {
         "title": "OONI API specification",
-        "version": "0.20210310.3121735"
+        "version": "0.20210331.3145007"
     },
     "host": "api.ooni.io",
     "basePath": "/",