[Backport release/3.9] gdaldem color-relief: fix issues with entry at 0 and -exact_color_entry mode, and other issues #12386

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python@3.11 3.11.9_1 is already installed and up-to-date. To reinstall 3.11.9_1, run: brew reinstall python@3.11

Formula postgresql was renamed to postgresql@14.

Treating doxygen as a formula. For the cask, use homebrew/cask/doxygen or specify the `--cask` flag.

pkg-config 0.29.2_3 is already installed and up-to-date. To reinstall 0.29.2_3, run: brew reinstall pkg-config

giflib 5.2.2 is already installed and up-to-date. To reinstall 5.2.2, run: brew reinstall giflib

jpeg-turbo 3.0.3 is already installed and up-to-date. To reinstall 3.0.3, run: brew reinstall jpeg-turbo