govulncheck-action: rename to golang-govulncheck-action

Rename action to golang-govulncheck-action, since govulncheck-action and
govulncheck are already taken on the GitHub marketplace.

Change-Id: I4f329b8dce27d9ecef0f78650579e7ba74997252
Reviewed-on: https://go-review.googlesource.com/c/govulncheck-action/+/496876
TryBot-Bypass: Julie Qiu <julie@golang.org>
Reviewed-by: Brandon Kessler <bkessler@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>
Reviewed-by: Julie Qiu <julieqiu@google.com>
diff --git a/action.yml b/action.yml
index a46751b..0a48559 100644
--- a/action.yml
+++ b/action.yml
@@ -1,4 +1,4 @@
-name: 'govulncheck'
+name: 'golang-govulncheck-action'
 description: 'Run govulncheck'
 inputs:
   go-version-input:  # version of Go to use for govulncheck