Automatically prune unused Go dependencies

The way gazelle was set up meant that it would never prune any
dependencies from go_deps.bzl. I'm not exactly sure _why_, but that's
the way it behaved.

The new approach here in this patch is to essentially null out
go_deps.bzl and have gazelle regenerate it from scratch.

Signed-off-by: Philipp Schrader <philipp.schrader@gmail.com>
Change-Id: Ic94020df816afa0df798b19b16b11272579793be
diff --git a/tools/go/tweak_gazelle_go_deps.py b/tools/go/tweak_gazelle_go_deps.py
index 7189d43..d9d7901 100644
--- a/tools/go/tweak_gazelle_go_deps.py
+++ b/tools/go/tweak_gazelle_go_deps.py
@@ -12,14 +12,14 @@
 import sys
 import textwrap
 
-import tools.go.mirror_lib
+import org_frc971.tools.go.mirror_lib
 
 def main(argv):
     parser = argparse.ArgumentParser()
     parser.add_argument("go_deps_bzl", type=str)
     args = parser.parse_args(argv[1:])
 
-    repos = tools.go.mirror_lib.parse_go_repositories(args.go_deps_bzl)
+    repos = org_frc971.tools.go.mirror_lib.parse_go_repositories(args.go_deps_bzl)
 
     with open(args.go_deps_bzl, "w") as file:
         file.write(textwrap.dedent("""\