[SM-1288] - Configure renovate to track go dependencies (#811)

## 🎟️ Tracking

https://bitwarden.atlassian.net/browse/SM-1288

## 📔 Objective

Configure dependency tracking for the Go wrapper. Dependency upgrades
should be tracked here, rather than the `bitwarden/sm-sdk-go` repo,
since this is the source for what gets pushed there.

## ⏰ Reminders before review

- Contributor guidelines followed
- All formatters and local linters executed and passed
- Written new unit and / or integration tests where applicable
- Protected functional changes with optionality (feature flags)
- Used internationalization (i18n) for all UI strings
- CI builds passed
- Communicated to DevOps any deployment requirements
- Updated any necessary documentation (Confluence, contributing docs) or
informed the documentation
  team

## 🦮 Reviewer guidelines

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- 👍 (`:+1:`) or similar for great changes
- 📝 (`:memo:`) or ℹ️ (`:information_source:`) for notes or general info
- ❓ (`:question:`) for questions
- 🤔 (`:thinking:`) or 💭 (`:thought_balloon:`) for more open inquiry
that's not quite a confirmed
  issue and could potentially benefit from discussion
- 🎨 (`:art:`) for suggestions / improvements
- ❌ (`:x:`) or ⚠️ (`:warning:`) for more significant problems or
concerns needing attention
- 🌱 (`:seedling:`) or ♻️ (`:recycle:`) for future improvements or
indications of technical debt
- ⛏ (`:pick:`) for minor or nitpick changes

Author: tangowithfoxtrot

.github/renovate.json

@@ -2,7 +2,10 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": ["github>bitwarden/renovate-config:non-pinned"],
   "separateMajorMinor": true,
-  "enabledManagers": ["cargo", "dockerfile", "github-actions", "npm", "nuget"],
+  "enabledManagers": ["cargo", "dockerfile", "github-actions", "gomod", "npm", "nuget"],
+  "constraints": {
+    "go": "1.21"
+  },
   "packageRules": [
     {
       "matchManagers": ["cargo"],
@@ -19,6 +22,11 @@
       "groupName": "gh minor",
       "matchManagers": ["github-actions"],
       "matchUpdateTypes": ["minor", "patch"]
+    },
+    {
+      "groupName": "go minor",
+      "matchManagers": ["gomod"],
+      "matchUpdateTypes": ["minor", "patch"]
     }
   ],
   "ignoreDeps": ["dotnet-sdk"]