Includes fixes for CVE-2023-1945, CVE-2023-29531, CVE-2023-29532,
CVE-2023-29533, CVE-2023-29535, CVE-2023-29536, CVE-2023-29539,
CVE-2023-29541, CVE-2023-29542, CVE-2023-29545, CVE-2023-29548,
CVE-2023-29550, and MFSA-TMP-2023-0001.
* gnu/packages/gnuzilla.scm (%icecat-base-version, %icecat-build-id): Update.
(icecat-source): Update gnuzilla commit, base version, and hashes.
Remove the vestigial RENAME_CMD environment variable setting.
(icecat-102.9.0-source): New variable.
(icedove-source): Use it.
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