Bump zlib from `5c42a23` to `4a5e3e7`

[dependabot[bot]]

Bumps zlib from 5c42a23 to 4a5e3e7.

Commits

• 4a5e3e7 Add zipAlreadyThere() to minizip zip.c to help avoid duplicates.
• 54e205f Permit changing minizip Makefile optimization with CFLAGS.
• a8c321b Make deflateBound() more conservative and handle Z_STREAM_END.
• 72d6aa2 Reduce Windows header inclusion to speed up compilation.
• 6544c3e Use lseek under WinCE.
• 35175f2 Remove conversion warning from msdos/Makefile.dj2.
• See full diff in compare view

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[dependabot[bot]]

Superseded by #288.