bump go version in docker

ci/release/build_in_docker.sh

@@ -4,7 +4,7 @@ cd -- "$(dirname "$0")/../.."
 . ./ci/sub/lib.sh
 
 tag="$(sh_c docker build \
-  --build-arg GOVERSION="1.19.3.linux-$ARCH" \
+  --build-arg GOVERSION="1.20.8.linux-$ARCH" \
   -qf ./ci/release/linux/Dockerfile ./ci/release/linux)"
 docker_run \
   -e DRY_RUN \

d2plugin/plugin.go

@@ -152,7 +152,6 @@ func ListPluginInfos(ctx context.Context, ps []Plugin) ([]*PluginInfo, error) {
 //  1. It first searches the bundled plugins in the global plugins slice.
 //  2. If not found, it then searches each directory in $PATH for a binary with the name
 //     d2plugin-<name>.
-//     **NOTE** When D2 upgrades to go 1.19, remember to ignore exec.ErrDot
 //  3. If such a binary is found, it builds an execPlugin in exec.go
 //     to get a plugin implementation around the binary and returns it.
 func FindPlugin(ctx context.Context, ps []Plugin, name string) (Plugin, error) {