chore: add acozzette to BCR maintainers (#3934)

## PR Checklist

Please check if your PR fulfills the following requirements:

- [ ] Tests for the changes have been added (for bug fixes / features)
- [ ] Docs have been added / updated (for bug fixes / features)


## PR Type

What kind of change does this PR introduce?

- [ ] Bugfix
- [ ] Feature (please, look at the "Scope of the project" section in the
README.md file)
- [ ] Code style update (formatting, local variables)
- [ ] Refactoring (no functional changes, no api changes)
- [ ] Build related changes
- [ ] CI related changes
- [ ] Documentation content changes
- [x] Other... Please describe:


## What is the current behavior?

Issue Number: N/A

## What is the new behavior?

## Does this PR introduce a breaking change?

- [ ] Yes
- [x] No

## Other information

.bcr/metadata.template.json

diff --git a/.bcr/metadata.template.json b/.bcr/metadata.template.json
index c3dc32d..16cf523 100644
--- a/.bcr/metadata.template.json
+++ b/.bcr/metadata.template.json
@@ -10,6 +10,11 @@
       "email": "jason@aspect.build",
       "github": "jbedard",
       "name": "Jason Bedard"
+    },
+    {
+      "email": "adamc@aspect.build",
+      "github": "acozzette",
+      "name": "Adam Cozzette"
     }
   ],
   "repository": ["github:bazel-contrib/rules_nodejs"],