Update Alex version in ci-images to 3.2.7.3
Due to #22356 (closed), we need to use alex 3.2.7.3 to generate the lexer in Cabal-syntax at least on javascript backend.
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Due to #22356 (closed), we need to use alex 3.2.7.3 to generate the lexer in Cabal-syntax at least on javascript backend.