[dev.boringcrypto] misc/boring: add new releases to RELEASES file

Fixes #42589

Change-Id: Ieba62381d6561d4803448c123ce1f1d5980b8a76
Reviewed-on: https://go-review.googlesource.com/c/go/+/269762
Trust: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>

misc/boring/RELEASES

@@ -105,3 +105,7 @@ go1.14.10b4 b5fc12785be4 linux-amd64 https://go-boringcrypto.storage.googleapis.
 go1.14.10b4 b5fc12785be4 src https://go-boringcrypto.storage.googleapis.com/go1.14.10b4.src.tar.gz daf7603babc49935efdea5befb2ecad823771523a84d1ba6c0e8c10fac982d59
 go1.15.3b5 ed9dc25d693c linux-amd64 https://go-boringcrypto.storage.googleapis.com/go1.15.3b5.linux-amd64.tar.gz 34ec7ec094f5e9349f1612b5f6d8f014b3a7b37b6986aeedcd0fe7cf2dc76a62
 go1.15.3b5 ed9dc25d693c src https://go-boringcrypto.storage.googleapis.com/go1.15.3b5.src.tar.gz bc37727287366aabb47594717cebd0a759147d8b2eb4cd3a45a19317af199fe9
+go1.14.12b4 21ba30ad409a linux-amd64 https://go-boringcrypto.storage.googleapis.com/go1.14.12b4.linux-amd64.tar.gz 7f9fb67a3c59fff24e3c51fa2a7435f4195cfb33844c9c2def27c162cc23604b
+go1.14.12b4 21ba30ad409a src https://go-boringcrypto.storage.googleapis.com/go1.14.12b4.src.tar.gz 948d7a77a4a890a7258102bcc7b63890f238061dfb6a4c06033660e727e87fcf
+go1.15.5b5 11087322f85d linux-amd64 https://go-boringcrypto.storage.googleapis.com/go1.15.5b5.linux-amd64.tar.gz 9c97488137f1f560b3fff0d8a2a9c45d2de8790fb8952a42b46cc4633528fc48
+go1.15.5b5 11087322f85d src https://go-boringcrypto.storage.googleapis.com/go1.15.5b5.src.tar.gz ee933cb1a4b591794dbcce99740032506af25ee202765dcc6979feb5abc114fc