Bump golang.org/x/sync from 0.6.0 to 0.7.0

Bumps [golang.org/x/sync](https://github.com/golang/sync) from 0.6.0 to 0.7.0.
- [Commits](golang/sync@v0.6.0...v0.7.0)

---
updated-dependencies:
- dependency-name: golang.org/x/sync
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

go.mod

@@ -2,4 +2,4 @@ module github.com/neilotoole/fifomu
 
 go 1.20
 
-require golang.org/x/sync v0.6.0
+require golang.org/x/sync v0.7.0

go.sum

@@ -1,2 +1,2 @@
-golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
-golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
+golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=