Change NEP29 to SPEC0 in release checklist (#3221)

Patches #3037

Author: weiji14

.github/ISSUE_TEMPLATE/4-release_checklist.md

@@ -43,7 +43,7 @@ assignees: ''
 - [ ] Manually upload the pygmt-vX.Y.Z.zip and baseline-images.zip files to https://zenodo.org/deposit, ensure that it is filed under the correct reserved DOI
 
 **After release**:
-- [ ] Update conda-forge [pygmt-feedstock](https://github.com/conda-forge/pygmt-feedstock) [Done automatically by conda-forge's bot, but remember to pin NEP29 versions]
+- [ ] Update conda-forge [pygmt-feedstock](https://github.com/conda-forge/pygmt-feedstock) [Done automatically by conda-forge's bot, but remember to pin SPEC0 versions]
 - [ ] Bump PyGMT version on https://github.com/GenericMappingTools/try-gmt (after conda-forge update)
 - [ ] Announce the release on:
   - [ ] GMT [forum](https://forum.generic-mapping-tools.org/c/news/) (do this announcement first! draft on https://hackmd.io/@pygmt. requires moderator status)