Bug 1597836 - Update sccache in-tree to the current master r=dmajor,firefox-build-system-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D53903

--HG--
extra : moz-landing-system : lando

taskcluster/ci/fetch/toolchains.yml

@@ -342,7 +342,7 @@ sccache:
         type: git
         repo: https://github.com/mozilla/sccache
         # 0.2.12 release + a handful of fixes
-        revision: a015edacf0c95c688462a3e60be417ffa66bed2b
+        revision: 2a89cd6922469416d297f3fd9029d4d0a2686e3c
 
 openssl-1.1.0g:
     description: openssl 1.1.0g source code