gh-40644: bump plantri to version 5.5
    
Plantri 5.5 has been released on May 17, 2024.
- https://users.cecs.anu.edu.au/~bdm/plantri/
- tar.gz: https://users.cecs.anu.edu.au/~bdm/plantri/plantri55.tar.gz


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- [x] The description explains in detail what this PR is about.
- [ ] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [ ] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

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URL: #40644
Reported by: David Coudert
Reviewer(s): Frédéric Chapoton

Author: Release Manager

build/pkgs/plantri/checksums.ini

@@ -1,4 +1,4 @@
 tarball=plantri${VERSION_MAJOR}${VERSION_MINOR}.tar.gz
-sha1=a04aec2fa90c43f1c9bef59d041a54d8fa5bf562
-sha256=5036804de6e3bee7bd54b6e46009a2c1f7c89067010b5e532cda84907a3559a2
+sha1=a6fe513228b87001b28e7b710819a748bc1a9899
+sha256=911cdf5bcca7294eb80f8f79fefc148183f7ba81da15b3aa4d6d2401a3bc7ded
 upstream_url=https://users.cecs.anu.edu.au/~bdm/plantri/plantri${VERSION_MAJOR}${VERSION_MINOR}.tar.gz

build/pkgs/plantri/package-version.txt

@@ -1 +1 @@
-5.3
+5.5