gh-41292: restore lazy_import of maxima in calculus.py

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On #40265 the lazy import of the maxima interface in calculus.py was
converted to a normal import. This PR restores the lazy import.
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The maxima interface is imported lazily to avoid the significant cost of
starting and initializing the ECL and maxima_lib interfaces.
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example, "Fixes #12345". -->

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### ⌛ Dependencies

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URL: #41292
Reported by: nbruin
Reviewer(s): Michael Orlitzky, Tobias Diez

Author: Release Manager

build/pkgs/configure/checksums.ini

@@ -1,3 +1,3 @@
 tarball=configure-VERSION.tar.gz
-sha1=2b8ed0a6efdcecee23827226d82539d81a899962
-sha256=bee999bb3e27feff36f9515e03dfc85c1d0a35bda1c65417b993d34dbc777428
+sha1=b782877ad8d7e1bfc2601ebfa15c54e3702c46c3
+sha256=861d39383635537eeda09680bdfa132748d31bddb26d2d1684726ae669b0e74e

build/pkgs/configure/package-version.txt

@@ -1 +1 @@
-7202dcde7d61cd97df8bb5748b47e5622a710417
+04838c9c81e4051fc1a3a8a9a3b5541ef4b7a008

src/sage/calculus/calculus.py

@@ -426,7 +426,8 @@
 from types import FunctionType
 
 from sage.arith.misc import algebraic_dependency
-from sage.interfaces.maxima_lib import maxima
+from sage.misc.lazy_import import lazy_import
+lazy_import("sage.interfaces.maxima_lib","maxima")
 from sage.misc.latex import latex
 from sage.misc.parser import LookupNameMaker, Parser
 from sage.rings.cc import CC

src/sage/calculus/desolvers.py

@@ -75,7 +75,8 @@
 import shutil
 
 from sage.calculus.functional import diff
-from sage.interfaces.maxima_lib import maxima
+from sage.misc.lazy_import import lazy_import
+lazy_import("sage.interfaces.maxima_lib","maxima")
 from sage.misc.functional import N
 from sage.rings.real_mpfr import RealField
 from sage.structure.element import Expression