Require happy >= 1.19.10

See https://mail.haskell.org/pipermail/ghc-devs/2019-May/017600.html

aarch64-linux-deb9/Dockerfile

@@ -62,7 +62,7 @@ WORKDIR /home/ghc/
 
 # Build Haskell tools
 RUN cabal update && \
-    cabal install hscolour happy alex
+    cabal install hscolour happy alex --constraint 'happy ^>= 1.19.10'
 ENV PATH /home/ghc/.cabal/bin:$PATH
 
 CMD ["bash"]

i386-linux-deb8/Dockerfile

@@ -43,7 +43,7 @@ WORKDIR /home/ghc/
 
 # Build Haskell tools
 RUN cabal v2-update && \
-    cabal v2-install hscolour happy alex
+    cabal v2-install hscolour happy alex --constraint 'happy ^>= 1.19.10'
 ENV PATH /home/ghc/.cabal/bin:$PATH
 
 CMD ["bash"]

i386-linux-deb9/Dockerfile

@@ -40,7 +40,7 @@ WORKDIR /home/ghc/
 
 # Build Haskell tools
 RUN cabal v2-update && \
-    cabal v2-install hscolour happy alex
+    cabal v2-install hscolour happy alex --constraint 'happy ^>= 1.19.10'
 ENV PATH /home/ghc/.cabal/bin:$PATH
 
 CMD ["bash"]

x86_64-linux-centos7/Dockerfile

@@ -57,7 +57,7 @@ WORKDIR /home/ghc/
 
 # Build Haskell tools
 RUN cabal v2-update && \
-    cabal v2-install hscolour happy alex
+    cabal v2-install hscolour happy alex --constraint 'happy ^>= 1.19.10'
 ENV PATH /home/ghc/.cabal/bin:$PATH
 
 CMD ["bash"]

x86_64-linux-deb8/Dockerfile

@@ -39,7 +39,7 @@ WORKDIR /home/ghc/
 
 # Build Haskell tools
 RUN cabal v2-update && \
-    cabal v2-install hscolour happy alex
+    cabal v2-install hscolour happy alex --constraint 'happy ^>= 1.19.10'
 ENV PATH /home/ghc/.cabal/bin:$PATH
 
 CMD ["bash"]

x86_64-linux-deb9/Dockerfile

@@ -48,7 +48,7 @@ WORKDIR /home/ghc/
 
 # Build Haskell tools
 RUN cabal v2-update && \
-    cabal v2-install hscolour happy alex
+    cabal v2-install hscolour happy alex --constraint 'happy ^>= 1.19.10'
 ENV PATH /home/ghc/.cabal/bin:$PATH
 
 CMD ["bash"]

x86_64-linux-fedora27/Dockerfile

@@ -52,7 +52,7 @@ WORKDIR /home/ghc/
 
 # Build Haskell tools
 RUN cabal v2-update && \
-    cabal v2-install hscolour happy alex
+    cabal v2-install hscolour happy alex --constraint 'happy ^>= 1.19.10'
 ENV PATH /home/ghc/.cabal/bin:$PATH
 
 CMD ["bash"]