fix: syncronously create the symlink to the requirements zip #862
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Currently, the symlink is created asynchronously. On a 14-CPUs MacBook Pro the current code leads to a raise condition - the symlink not yet existing during subsequent attempy to use it, but existing afterward. This happens in ~90% of the invocations:
Serverless: Packaging Python Requirements Lambda Layer...
Serverless: Found cached Python Requirements Lambda Layer file
Exception -----------------------------------------------
OperationalError: ENOENT: no such file or directory, open '/Users/XXXX/git/YYYY/.serverless/pythonRequirements.zip'
Patching the code locally as proposed, fixes the problem.
Also, making the symlinkSync() call will be consistent with making the copySync() call in the adjacent if(...) statement branch.