build(deps): add vcsim to rpm

Closes: #3413

Previously, we enabled rpm builds. However, only 'govc' was added.
Let's add 'vcsim', too, as the package name 'govmomi' implies it.

Signed-off-by: Sebastian Mitterle <smitterl@redhat.com>

.goreleaser.yml

@@ -37,6 +37,7 @@ nfpms:
   - package_name: govmomi
     builds:
       - govc
+      - vcsim
     homepage: https://github.com/vmware/govmomi
     maintainer: Doug MacEachern <dougm@vmware.com>
     description: |-