gh-35302: update pari to 2.15.4, drop patch
    
### 📚 Description

update pari to 2.15.4, drop patch

Will fix #35219

### 📝 Checklist

- [x] I have made sure that the title is self-explanatory and the
description concisely explains the PR.
    
URL: #35302
Reported by: Dima Pasechnik
Reviewer(s): Dima Pasechnik, Lorenz Panny, Michael Orlitzky

Author: Release Manager

build/pkgs/pari/checksums.ini

@@ -1,5 +1,5 @@
 tarball=pari-VERSION.tar.gz
-sha1=498e3cd0b7ded8be3fa1cba1125ca5213ed39453
-md5=562a6e973ca3980dc6c1eb2c4f252e92
-cksum=4081416981
+sha1=ae962671b5bf86849d2021113dfb5b2f59331a10
+md5=4ab5c81d93f4bccb94e483b8b48fc336
+cksum=598072677
 upstream_url=https://pari.math.u-bordeaux.fr/pub/pari/unix/pari-VERSION.tar.gz

build/pkgs/pari/package-version.txt

@@ -1 +1 @@
-2.15.2.p1
+2.15.4

build/pkgs/pari/patches/bug2441.patch

@@ -67,6 +67,25 @@ SAGE_SPKG_CONFIGURE([pari], [
             AC_MSG_NOTICE([Otherwise Sage will build its own pari/GP.])
             sage_spkg_install_pari=yes
         fi
+
+        AC_MSG_CHECKING([whether factor() bug 2469 of pari 2.15.3 is fixed])
+        result=`echo "f=factor(2^2203-1); print(\"ok\")" | timeout 1 $GP -qf`
+        if test x"$result" = xok; then
+          AC_MSG_RESULT([yes])
+        else
+           AC_MSG_RESULT([no; cannot use system pari/GP with known bug])
+           sage_spkg_install_pari=yes
+        fi
+
+        AC_MSG_CHECKING([whether qfbclassno() bug 2466 of pari 2.15.3 is fixed])
+        result=`echo "qfbclassno(33844)" | $GP -qf`
+        if test x"$result" = x3; then
+          AC_MSG_RESULT([yes])
+        else
+           AC_MSG_RESULT([no; cannot use system pari/GP with known bug])
+           sage_spkg_install_pari=yes
+        fi
+
     fi dnl end GP test
 
       if test x$sage_spkg_install_pari = xno; then dnl main PARI test

build/pkgs/pari/spkg-configure.m4

@@ -2688,6 +2688,11 @@ def factor(n, proof=None, int_=False, algorithm='pari', verbose=0, **kwds):
         Traceback (most recent call last):
         ...
         TypeError: unable to factor 'xyz'
+
+    Test that :issue:`35219` is fixed::
+
+        sage: len(factor(2^2203-1,proof=false))
+        1
     """
     try:
         m = n.factor

src/sage/arith/misc.py

@@ -615,7 +615,7 @@ def _next_var_name(self):
         The vector of results is correctly resized when the stack has
         to be enlarged during this operation::
 
-            sage: g = Gp(stacksize=10^4,init_list_length=12000)  # long time
+            sage: g = Gp(stacksize=3*10^6,init_list_length=12000)  # long time
             sage: for n in [1..13000]:  # long time
             ....:     a = g(n)
             sage: g('length(sage)')     # long time

src/sage/interfaces/gp.py

@@ -1083,6 +1083,14 @@ def class_number(self, proof=None):
             NotImplementedError: computation of class numbers of non-maximal orders
             not in quadratic fields is not implemented
 
+        TESTS:
+
+        Test for PARI bug #2466::
+
+            sage: x = polygen(ZZ)
+            sage: R.<t> = EquationOrder(x^2 - 8461)
+            sage: R.class_number()
+            3
         """
         if not self.is_maximal():
             K = self.number_field()