Much more conservative highlighting for 1.12

Following a few vigorous complaints about the highlighting scheme
introduced by JuliaSyntaxHighlighting, I've pared back the default
behaviour to something much more conservative.

(cherry picked from commit 9a46bf5)

Author: tecosaur

deps/checksums/JuliaSyntaxHighlighting-b666d3c98cca30d20d1e6f98c0e12c9350ffbc4c.tar.gz/md5

@@ -0,0 +1 @@
+778d62517cab8b4a95920337631f9439

deps/checksums/JuliaSyntaxHighlighting-b666d3c98cca30d20d1e6f98c0e12c9350ffbc4c.tar.gz/sha512

@@ -0,0 +1 @@
+95db08cd6775920271e347bae3ee4a68ef532ec6dceb834a63bc8f918b785c042c2bed9babf9ca76ff610ee2782130a69b4ecf158e4beae6361115cdef57dc51

deps/checksums/JuliaSyntaxHighlighting-b7a1c636d3e9690bfbbfe917bb20f6cb112a3e6f.tar.gz/md5

@@ -1,4 +1,4 @@
 JULIASYNTAXHIGHLIGHTING_BRANCH = main
-JULIASYNTAXHIGHLIGHTING_SHA1 = b7a1c636d3e9690bfbbfe917bb20f6cb112a3e6f
+JULIASYNTAXHIGHLIGHTING_SHA1 = b666d3c98cca30d20d1e6f98c0e12c9350ffbc4c
 JULIASYNTAXHIGHLIGHTING_GIT_URL := https://github.com/julialang/JuliaSyntaxHighlighting.jl.git
 JULIASYNTAXHIGHLIGHTING_TAR_URL = https://api.github.com/repos/julialang/JuliaSyntaxHighlighting.jl/tarball/$1

deps/checksums/JuliaSyntaxHighlighting-b7a1c636d3e9690bfbbfe917bb20f6cb112a3e6f.tar.gz/sha512

@@ -117,9 +117,12 @@ end
 
 function term(io::IO, md::Code, columns)
     code = if md.language == "julia"
-        highlight(md.code)
+        hl = AnnotatedString(md.code)
+        StyledStrings.face!(hl, :markdown_code)
+        highlight!(hl)
     elseif md.language == "julia-repl" || Base.startswith(md.language, "jldoctest")
         hl = AnnotatedString(md.code)
+        StyledStrings.face!(hl, :markdown_code)
         for (; match) in eachmatch(r"(?:^|\n)julia>", hl)
             StyledStrings.face!(match, :markdown_julia_prompt)
             afterprompt = match.offset + ncodeunits(match) + 1