Bump stack to 2.7.3

Author: AlistairB

8.10/buster/Dockerfile

@@ -9,7 +9,7 @@ RUN apt-get update && \
 ARG GHC=8.10.4
 ARG DEBIAN_KEY=427CB69AAC9D00F2A43CAF1CBA3CBA3FFE22B574
 ARG CABAL_INSTALL=3.4
-ARG STACK=2.7.1
+ARG STACK=2.7.3
 ARG STACK_KEY=C5705533DA4F78D8664B5DC0575159689BEFB442
 ARG STACK_RELEASE_KEY=2C6A674E85EE3FB896AFC9B965101FF31C5C154D
 

8.10/stretch/Dockerfile

@@ -9,7 +9,7 @@ RUN apt-get update && \
 ARG GHC=8.10.4
 ARG DEBIAN_KEY=427CB69AAC9D00F2A43CAF1CBA3CBA3FFE22B574
 ARG CABAL_INSTALL=3.4
-ARG STACK=2.7.1
+ARG STACK=2.7.3
 ARG STACK_KEY=C5705533DA4F78D8664B5DC0575159689BEFB442
 ARG STACK_RELEASE_KEY=2C6A674E85EE3FB896AFC9B965101FF31C5C154D
 

9.0/buster/Dockerfile

@@ -9,7 +9,7 @@ RUN apt-get update && \
 ARG GHC=9.0.1
 ARG DEBIAN_KEY=427CB69AAC9D00F2A43CAF1CBA3CBA3FFE22B574
 ARG CABAL_INSTALL=3.4
-ARG STACK=2.7.1
+ARG STACK=2.7.3
 ARG STACK_KEY=C5705533DA4F78D8664B5DC0575159689BEFB442
 ARG STACK_RELEASE_KEY=2C6A674E85EE3FB896AFC9B965101FF31C5C154D
 

9.0/stretch/Dockerfile

@@ -9,7 +9,7 @@ RUN apt-get update && \
 ARG GHC=9.0.1
 ARG DEBIAN_KEY=427CB69AAC9D00F2A43CAF1CBA3CBA3FFE22B574
 ARG CABAL_INSTALL=3.4
-ARG STACK=2.7.1
+ARG STACK=2.7.3
 ARG STACK_KEY=C5705533DA4F78D8664B5DC0575159689BEFB442
 ARG STACK_RELEASE_KEY=2C6A674E85EE3FB896AFC9B965101FF31C5C154D