build(deps): bump github.com/magiconair/properties in /proxy

Bumps [github.com/magiconair/properties](https://github.com/magiconair/properties) from 1.8.9 to 1.8.10.
- [Release notes](https://github.com/magiconair/properties/releases)
- [Commits](https://github.com/magiconair/properties/compare/v1.8.9...v1.8.10)

---
updated-dependencies:
- dependency-name: github.com/magiconair/properties
  dependency-version: 1.8.10
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

proxy/go.mod

@@ -5,7 +5,7 @@ go 1.17
 require (
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
 	github.com/gorilla/handlers v1.5.2
-	github.com/magiconair/properties v1.8.9
+	github.com/magiconair/properties v1.8.10
 	github.com/spf13/pflag v1.0.6
 	github.com/spf13/viper v1.19.0
 )