Bump lower bounds in servant

- `text` is already 1.2.3.0 as commercialhaskell/stackage#3147
  is resolved AFAICS

- `http-types` bound is surprisingly low due:
  commercialhaskell/stackage#2976

servant/servant.cabal

@@ -63,29 +63,38 @@ library
     Servant.API.WithNamedContext
     Servant.Utils.Links
     Servant.Utils.Enter
+
+  -- Bundled with GHC: Lower bound to not force re-installs
+  -- text and mtl are bundled with GHC
+  --
+  -- note: mtl lower bound is so low because of GHC-7.8
   build-depends:
-      base                  >= 4.7  && < 4.11
-    , base-compat           >= 0.9  && < 0.10
-    , aeson                 >= 0.7  && < 1.3
-    , attoparsec            >= 0.12 && < 0.14
-    , bytestring            >= 0.10 && < 0.11
-    , case-insensitive      >= 1.2  && < 1.3
-    , http-api-data         >= 0.3  && < 0.4
-    , http-media            >= 0.4  && < 0.8
-    , http-types            >= 0.8  && < 0.12
-    , natural-transformation >= 0.4 && < 0.5
-    , mtl                   >= 2.0  && < 2.3
-    , mmorph                >= 1    && < 1.2
-    , tagged                >= 0.7.3 && < 0.9
-    , text                  >= 1    && < 1.3
-    , singleton-bool        >= 0.1.2.0 && <0.2
-    , string-conversions    >= 0.3  && < 0.5
-    , network-uri           >= 2.6  && < 2.7
-    , vault                 >= 0.3  && < 0.4
+      base                  >= 4.7     && < 4.11
+    , bytestring            >= 0.10    && < 0.11
+    , mtl                   >= 2.0.1   && < 2.3
+    , text                  >= 1.2.3.0 && < 1.3
+
+  -- Other dependencies: Lower bound around what is in the latest Stackage LTS.
+  -- Here can be exceptions if we really need features from the newer versions.
+  build-depends: 
+      base-compat            >= 0.9.3    && < 0.10
+    , aeson                  >= 1.2.3.0  && < 1.3
+    , attoparsec             >= 0.13.2.0 && < 0.14
+    , case-insensitive       >= 1.2.0.10 && < 1.3
+    , http-api-data          >= 0.3.7.1  && < 0.4
+    , http-media             >= 0.7.1.1  && < 0.8
+    , http-types             >= 0.9.1    && < 0.12
+    , natural-transformation >= 0.4      && < 0.5
+    , mmorph                 >= 1.1.0    && < 1.2
+    , tagged                 >= 0.8.5    && < 0.9
+    , singleton-bool         >= 0.1.2.0  && < 0.2
+    , string-conversions     >= 0.4.0.1  && < 0.5
+    , network-uri            >= 2.6.1.0  && < 2.7
+    , vault                  >= 0.3.0.7  && < 0.4
 
   if !impl(ghc >= 8.0)
     build-depends:
-      semigroups            >= 0.16 && < 0.19
+      semigroups            >= 0.18.3 && < 0.19
 
   hs-source-dirs: src
   default-language: Haskell2010