[CI] Update sccache to latest release (#93)

Co-authored-by: trivialfis <16746409+trivialfis@users.noreply.github.com>

Author: token-generator-for-automated-prs[bot]

actions/sccache/action.yml

@@ -6,7 +6,7 @@ inputs:
   version:
     description: 'Version of sccache to install'
     required: false
-    default: 'v0.14.0-rapids.15'
+    default: 'v0.14.0-rapids.18'
   cache-key-prefix:
     description: 'Prefix for the cache key'
     required: false