Update LaTeX version in test files

Author: zauguin

testfiles-latex-TU/tu-composites01.tlg

@@ -384,5 +384,5 @@ Missing character: There is no ̨ (U+0328) in font [lmroman10-regular]:+tlig;!
 ] (tu-composites01.aux)
  ***********
 LaTeX2e <2023-06-01> patch level 1
-L3 programming layer <2023-06-30>
+L3 programming layer <2023-08-03>
  ***********

testfiles-latex-TU/tu-composites02.tlg

@@ -201,5 +201,5 @@ l. ...\test{z}
 (tu-composites02.aux)
  ***********
 LaTeX2e <2023-06-01> patch level 1
-L3 programming layer <2023-06-30>
+L3 programming layer <2023-08-03>
  ***********

testfiles-latex-TU/tu-tl2e7.tlg

@@ -1388,5 +1388,5 @@ Missing character: There is no ̧ (U+0327) in font [lmroman10-regular]:+tlig;!
 (tu-tl2e7.aux)
  ***********
 LaTeX2e <2023-06-01> patch level 1
-L3 programming layer <2023-06-30>
+L3 programming layer <2023-08-03>
  ***********