deps: require base >=4.11, prevent red squares on hackage matrix

We officially support GHC 8.6+ (and 8.8+ for hledger-web) now.
Hackage matrix builder shows all packages building successfully
with GHC 8.4+, somehow, so we'll adjust the base bound to
allow that but prevent any attempts to build with older GHCs,

hledger-lib/package.yaml

@@ -32,7 +32,7 @@ extra-source-files:
 #data-files:
 
 dependencies:
-- base >=4.10.1.0 && <4.16
+- base >=4.11 && <4.16
 - base-compat-batteries >=0.10.1 && <0.12
 - aeson >=1
 - aeson-pretty

hledger-ui/package.yaml

@@ -45,7 +45,7 @@ dependencies:
 - hledger >=1.22.99 && <1.23
 - ansi-terminal >=0.9
 - async
-- base >=4.10.1.0 && <4.16
+- base >=4.11 && <4.16
 - base-compat-batteries >=0.10.1 && <0.12
 - cmdargs >=0.8
 - containers >=0.5.9

hledger-web/package.yaml

@@ -102,7 +102,7 @@ library:
   - hledger-lib >=1.22.99 && <1.23
   - hledger >=1.22.99 && <1.23
   - aeson >=1
-  - base >=4.10.1.0 && <4.16
+  - base >=4.11 && <4.16
   - blaze-html
   - blaze-markup
   - bytestring

hledger/package.yaml

@@ -99,7 +99,7 @@ dependencies:
 - hledger-lib >=1.22.99 && <1.23
 - aeson >=1
 - ansi-terminal >=0.9
-- base >=4.10.1.0 && <4.16
+- base >=4.11 && <4.16
 - base-compat-batteries >=0.10.1 && <0.12
 - bytestring
 - cmdargs >=0.10