Revert the un-skip of 3 emoji rendering tests

They randomly fails. We suspect we need a more recent version of the cairo/harfbuzz/freetype libs stack.

src/Alexandrie-Canvas-Tests/AeCanvasTest.class.st

@@ -301,6 +301,9 @@ AeCanvasTest >> renderCurvedFigure [
 AeCanvasTest >> renderEmoji [
 
 	| fontHeight aeCanvas cairoScaledFont cairoGlyphsArray |
+
+	self skip. "Randomly fails. We suspect we need a more recent version of cairo (it introduced improvements in this area)."
+
 	fontHeight := 25.
 	aeCanvas := AeCanvas extent: fontHeight * 1.3 asPoint.
 	aeCanvas clear: Color paleYellow.
@@ -475,6 +478,9 @@ AeCanvasTest >> renderOpenFigure [
 AeCanvasTest >> renderZWJEmojiWithHarfbuzz [
 
 	| fontHeight aeCanvas cairoScaledFont cairoGlyphsArray |
+
+	self skip. "Randomly fails. We suspect we need a more recent version of cairo (it introduced improvements in this area)."
+
 	fontHeight := 24.
 	aeCanvas := AeCanvas extent: 200 @ (fontHeight * 2).
 	aeCanvas clear: Color white.
@@ -507,6 +513,9 @@ AeCanvasTest >> renderZWJEmojiWithHarfbuzz [
 AeCanvasTest >> renderZWJEmojiWithoutHarfbuzz [
 
 	| fontHeight aeCanvas cairoScaledFont cairoGlyphsArray |
+
+	self skip. "Randomly fails. We suspect we need a more recent version of cairo (it introduced improvements in this area)."
+
 	fontHeight := 21.
 	aeCanvas := AeCanvas extent: (fontHeight * 5.5) @ (fontHeight * 1.2).
 	aeCanvas clear: Color white.