testing/repo: upgrade to 2.53

https://github.com/GerritCodeReview/git-repo/compare/v2.52...v2.53

testing/repo/APKBUILD

 # Contributor: Antoine Fontaine <antoine.fontaine@epfl.ch>
 # Maintainer: Patrycja Rosa <alpine@ptrcnull.me>
 pkgname=repo
-pkgver=2.52
+pkgver=2.53
 pkgrel=0
 pkgdesc="repository management tool built on top of git"
 url="https://gerrit.googlesource.com/git-repo"
@@ -24,5 +24,5 @@ package() {
 }
 
 sha512sums="
-991a527bb24c802df714c69d9c4b7e2119045f04776c8b9481e1fb9db8e852727bcfcf2de0b2bc5b3df8ca57e314795789cd824f75da10b3c2984d72a9319992  repo-2.52.tar.gz
+d86d66774894369a514966cc11f46f7cfa464be65f7829a8189a92bb403657aea9f422397f977d2aa1b6e29b52f74bc5dccbad693419e37db92ab41281e9f24c  repo-2.53.tar.gz
 "