internal/report, data/osv: populate schema_version field in osv entries

The vulnreport osv command now populates all generated osvs with the current schema version (1.3.1).
This CL also updates all previous OSV entries to also have the current schema version.

Change-Id: Ie95c91aae0ee623bbf50ff047190a0bbe59893d9
Reviewed-on: https://go-review.googlesource.com/c/vulndb/+/452440
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Tatiana Bradley <tatiana@golang.org>
Run-TryBot: Maceo Thompson <maceothompson@google.com>
diff --git a/data/osv/GO-2022-0229.json b/data/osv/GO-2022-0229.json
index 0fab082..afc1d67 100644
--- a/data/osv/GO-2022-0229.json
+++ b/data/osv/GO-2022-0229.json
@@ -99,5 +99,6 @@
     {
       "name": "Project Wycheproof"
     }
-  ]
+  ],
+  "schema_version": "1.3.1"
 }
\ No newline at end of file