sagemathgh-38141: build/pkgs/sympy: Update to 1.12.1, change to wheel package
    
<!-- ^ Please provide a concise and informative title. -->
<!-- ^ Don't put issue numbers in the title, do this in the PR
description below. -->
<!-- ^ For example, instead of "Fixes sagemath#12345" use "Introduce new method
to calculate 1 + 2". -->
<!-- v Describe your changes below in detail. -->
<!-- v Why is this change required? What problem does it solve? -->
<!-- v If this PR resolves an open issue, please link to it here. For
example, "Fixes sagemath#12345". -->

This is a small maintenance update
- https://github.com/sympy/sympy/wiki/release-notes-for-1.12.1

### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->

- [x] The title is concise and informative.
- [ ] 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

<!-- List all open PRs that this PR logically depends on. For example,
-->
<!-- - sagemath#12345: short description why this is a dependency -->
<!-- - sagemath#34567: ... -->
    
URL: sagemath#38141
Reported by: Matthias Köppe
Reviewer(s): Kwankyu Lee

Author: Release Manager

build/pkgs/sympy/SPKG.rst

@@ -24,16 +24,5 @@ New BSD: http://www.opensource.org/licenses/bsd-license.php
 Upstream Contact
 ----------------
 
-sympy mailinglist: http://groups.google.com/group/sympy
+https://pypi.org/project/sympy/
 
-Dependencies
-------------
-
--  Python 2.5 or later
-
-
-Special Update/Build Instructions
----------------------------------
-
--  A simple script can be used to ease the updating of the SPKG. See the
-   README.

build/pkgs/sympy/checksums.ini

@@ -1,4 +1,4 @@
-tarball=sympy-VERSION.tar.gz
-sha1=604968f191e2d69053b8310066d089f73a1bd109
-sha256=ebf595c8dac3e0fdc4152c51878b498396ec7f30e7a914d6071e674d49420fb8
-upstream_url=https://github.com/sympy/sympy/releases/download/sympy-VERSION/sympy-VERSION.tar.gz
+tarball=sympy-VERSION-py3-none-any.whl
+sha1=80fa00ab605295d61992ca3faa76771a62944527
+sha256=9b2cbc7f1a640289430e13d2a56f02f867a1da0190f2f99d8968c2f74da0e515
+upstream_url=https://pypi.io/packages/py3/s/sympy/sympy-VERSION-py3-none-any.whl

build/pkgs/sympy/dependencies

@@ -1,4 +1,4 @@
- mpmath | $(PYTHON_TOOLCHAIN) $(PYTHON)
+mpmath | pip $(PYTHON)
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/sympy/package-version.txt

@@ -1 +1 @@
-1.12
+1.12.1