[LaTeX] Work around a minipage feature of LaTeX prior to June 2023

See "Improve spacing at top of minipages" in release notes of LaTeX June
2023 release.

https://www.latex-project.org/news/latex2e-news/ltnews37.pdf

sphinx/texinputs/sphinxlatexadmonitions.sty

@@ -282,10 +282,13 @@
 \newcommand\sphinxtitlerowbottompadding{3pt}
 \newcommand\sphinxtitlerowaftericonspacecmd{\hskip0.75em\relax}
 \newcommand\sphinxdotitlerowwithicon[2]{% #1=type, #2=heading (without final colon)
-    \kern-\spx@boxes@padding@top
-    \noindent
-    \kern-\spx@boxes@padding@left % must have been configured by a prior \spx@boxes@fcolorbox@setup{<type>}
-    \begingroup
+   \begingroup
+     \kern-\spx@boxes@padding@top
+     \parskip\z@skip % the \parskip business is a workaround to a vertical
+                     % glue issue showing in LaTeX earlier than 2023-06-01
+     \noindent
+     \kern-\spx@boxes@padding@left % must have been configured by a prior
+                                   % \spx@boxes@fcolorbox@setup{<type>}
      % inherit settings from the enclosing box and modify what is needed
      \spx@boxes@border@top    =\z@
      \spx@boxes@border@right  =\z@
@@ -311,9 +314,11 @@
          \sphinxstrong{#2}%
          \strut}%
       }%
-    \endgroup
-    \kern-\spx@boxes@padding@right
-    \par\vskip-\parskip\kern\spx@boxes@padding@top
+     \kern-\spx@boxes@padding@right
+     \par
+   \endgroup
+   \vskip-\parskip
+   \kern\spx@boxes@padding@top
 }
 
 % #1 holds the localized name of the notice, postfixed with a colon.