pandoc: update to 2.9.1.1.

Mixing stackage LTS-15.3 with GHC 8.6 is suboptimal, but it works.

srcpkgs/pandoc/template

@@ -1,17 +1,17 @@
 # Template file for 'pandoc'
 pkgname=pandoc
 # Keep in sync with http://www.stackage.org/lts
-version=2.7.3
-revision=2
-_citeproc_version=0.16.2
-_sidenote_version=0.19.0.0
+version=2.9.1.1
+revision=1
+_citeproc_version=0.16.4.1
+_sidenote_version=0.20.0
 _monad_gen_version=0.3.0.1
 create_wrksrc=yes
 build_style=haskell-stack
 make_build_args="
  --flag pandoc:embed_data_files --flag pandoc-citeproc:embed_data_files
  --flag=hslua:system-lua --flag=hslua:pkg-config"
-stackage="lts-14.11"
+stackage="lts-15.3"
 hostmakedepends="pkg-config unzip wget"
 makedepends="zlib-devel lua-devel"
 short_desc="Universal converter between markup formats (with citeproc support)"
@@ -20,11 +20,11 @@ license="GPL-2.0-or-later"
 homepage="http://johnmacfarlane.net/pandoc/"
 distfiles="http://hackage.haskell.org/package/${pkgname}-${version}/${pkgname}-${version}.tar.gz
  http://hackage.haskell.org/package/${pkgname}-citeproc-${_citeproc_version}/${pkgname}-citeproc-${_citeproc_version}.tar.gz
- http://hackage.haskell.org/package/${pkgname}-sidenote-${_sidenote_version}/${pkgname}-sidenote-${_sidenote_version}.tar.gz
+ https://github.com/jez/pandoc-sidenote/archive/${_sidenote_version}.tar.gz \
  https://hackage.haskell.org/package/monad-gen-${_monad_gen_version}/monad-gen-${_monad_gen_version}.tar.gz"
-checksum="a877203379ec5179716d6999f76352229d7f40f5bec70dbfa48c140848cef236
- 5b6725b003474f19fd7de65f3371a015a7b210b42543fe952f2bc4c7d509b596
- 63adff9f8069e36d6e347d9c3172b3b1c9d903a94195eff88d10d4ff5ae0e86f
+checksum="9d21c5efe2074f9b3097a20e0798de9d8b89a86a1ce04a307f476c7b4aa3816d
+ bd726878595ca66376c9536addc81a19bbab8f3517d41aa72165582dd0336dc9
+ 34ee7f46d6472c04884b1dcb030d701a32b885d9b0d4307d2c0da327a359cb7a
  be8485023fce236b5b915f2f6074f7b0470a2040f84cdd137c5227f1b4c98465"
 nocross=yes
 nopie_files="