GitLab CI: Up the manual cache bust token

The GHC 8.6.5 job was doing the
 error while loading shared libraries: libHS...so: cannot open shared object file: No such file or directory

Author: leonschoorl

.ci/gitlab/common.yml

@@ -5,7 +5,7 @@
   variables:
     # Note that we copy+paste the image name into CACHE_FALLBACK_KEY. If we don't,
     # $GHC_VERSION gets inserted at verbatim, instead of resolving to some ghc version.
-    CACHE_FALLBACK_KEY: $CI_JOB_NAME-master-ghcr.io/clash-lang/clash-ci-$GHC_VERSION:2023-08-22-1-3-non_protected
+    CACHE_FALLBACK_KEY: $CI_JOB_NAME-master-ghcr.io/clash-lang/clash-ci-$GHC_VERSION:2023-08-22-2-3-non_protected
     GIT_SUBMODULE_STRATEGY: recursive
     TERM: xterm-color
   retry:
@@ -14,7 +14,7 @@
       - runner_system_failure
       - stuck_or_timeout_failure
   cache:
-    key: $CI_JOB_NAME-$CI_COMMIT_REF_SLUG-$CI_JOB_IMAGE-1
+    key: $CI_JOB_NAME-$CI_COMMIT_REF_SLUG-$CI_JOB_IMAGE-2
     when: always
     paths:
       - cache.tar.zst