Update module mattn/go-sqlite3 to v2

This MR contains the following updates:

Package	Type	Update	Change
github.com/mattn/go-sqlite3	require	major	v1.14.6 -> v2.0.6

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Release Notes

mattn/go-sqlite3

v2.0.6

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v2.0.5

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v2.0.4

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v2.0.3

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v2.0.2

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v2.0.1

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go.mod

@@ -6,7 +6,7 @@ require (
 	git.autistici.org/ai3/go-common v0.0.0-20210110180225-a05c683cfe23
 	github.com/google/go-cmp v0.5.4
 	github.com/mattes/migrate v3.0.2-0.20180508041624-4768a648fbd9+incompatible
-	github.com/mattn/go-sqlite3 v1.14.6
+	github.com/mattn/go-sqlite3/v2/v2 v2.0.6
 	github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369 // indirect
 	gopkg.in/yaml.v2 v2.4.0
 )