Bump altcover.global from 8.6.125 to 8.7.3

Bumps [altcover.global](https://github.com/SteveGilham/altcover) from 8.6.125 to 8.7.3.
- [Release notes](https://github.com/SteveGilham/altcover/releases)
- [Changelog](https://github.com/SteveGilham/altcover/blob/master/ReleaseNotes%20-%20Previously.md)
- [Commits](https://github.com/SteveGilham/altcover/commits)

---
updated-dependencies:
- dependency-name: altcover.global
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.config/dotnet-tools.json

@@ -3,7 +3,7 @@
   "isRoot": true,
   "tools": {
     "altcover.global": {
-      "version": "8.6.125",
+      "version": "8.7.3",
       "commands": [
         "altcover"
       ]