chore: fix license tracking (#989)

## Which problem is this PR solving?

[go-licenses v1.1.0 dropped support for packages that aren't Go
modules](https://github.com/google/go-licenses/releases/tag/v1.1.0).
That or any later version run against our current repo state will result
in many dozens of this error:

> Package •thingie• does not have module info. Non go modules projects
are no longer supported. For feedback, refer to
google/go-licenses#128.

## Short description of the changes

Pinning our install to v1.0.0 seems to produce the LICENSES output
consistent with what the project has been tracking so far.

Makefile

@@ -68,7 +68,7 @@ clean:
 
 .PHONY: install-tools
 install-tools:
-	go install github.com/google/go-licenses@latest
+	go install github.com/google/go-licenses@v1.0.0
 
 .PHONY: update-licenses
 update-licenses: install-tools