rules_haskell_tests: Fix ghcide stack pointing to wrong snapshot file #2183
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The stack snapshot for GHC 9.2.8 was a symlink to the default snapshot file. So
when no
GHC_VERSION
was set in the environment, it meant the default snapshotfile was used, but the default version is GHC 9.4.6 now.
This led to an error on buildkite as base in GHC 9.4 was bumped to 4.17:
Symlink the default stack snapshot files to the specific version (not the other way around).
Fixes #2181