internal/releasetargets: use FreeBSD 13 for Go 1.20

For golang/go#40561.

Change-Id: Ideb41ea0ce6a2340fee6d98bf5672e361db81532
Reviewed-on: https://go-review.googlesource.com/c/build/+/454936
Reviewed-by: Dmitri Shuralyov <[email protected]>
Auto-Submit: Heschi Kreinick <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Run-TryBot: Heschi Kreinick <[email protected]>

Author: heschi

internal/releasetargets/releases.txt

@@ -111,10 +111,10 @@ darwin-amd64    darwin     amd64      darwin-amd64-13
 darwin-arm64    darwin     arm64      darwin-arm64-12
 	Running on reverse builder: macOS Monterey (12) ARM64 (M1) on Mac minis in a Google office
 
-freebsd-386     freebsd    386        freebsd-386-12_3
+freebsd-386     freebsd    386        freebsd-386-13_0
 	Running on GCP
 
-freebsd-amd64   freebsd    amd64      freebsd-amd64-12_3
+freebsd-amd64   freebsd    amd64      freebsd-amd64-13_0
 	Running on GCP
 
 linux-386       linux      386        linux-386-bullseye

internal/releasetargets/releasetargets.go

@@ -128,9 +128,13 @@ var allReleases = map[int]ReleaseTargets{
 		"darwin-arm64": &Target{
 			Builder: "darwin-arm64-12",
 		},
+		"freebsd-386": &Target{
+			SecondClass: true,
+			Builder:     "freebsd-386-13_0",
+		},
 		"freebsd-amd64": &Target{
 			SecondClass: true,
-			Builder:     "freebsd-amd64-12_3",
+			Builder:     "freebsd-amd64-13_0",
 		},
 		"linux-386": &Target{
 			Builder:         "linux-386-bullseye",