.drone.yml: Update CI cache

Author: smarter

.drone.yml

@@ -27,7 +27,7 @@ steps:
 
 - name: test
   pull: default
-  image: lampepfl/dotty:2019-09-10
+  image: lampepfl/dotty:2019-09-19
   depends_on: [ clone ]
   commands:
   - cp -R . /tmp/1/ && cd /tmp/1/
@@ -36,7 +36,7 @@ steps:
 
 - name: test_bootstrapped
   pull: default
-  image: lampepfl/dotty:2019-09-10
+  image: lampepfl/dotty:2019-09-19
   depends_on: [ clone ]
   commands:
   - cp -R . /tmp/2/ && cd /tmp/2/
@@ -45,7 +45,7 @@ steps:
 
 - name: community_build
   pull: default
-  image: lampepfl/dotty:2019-09-10
+  image: lampepfl/dotty:2019-09-19
   depends_on: [ clone ]
   commands:
   - cp -R . /tmp/3/ && cd /tmp/3/
@@ -55,7 +55,7 @@ steps:
 
 - name: test_sbt
   pull: default
-  image: lampepfl/dotty:2019-09-10
+  image: lampepfl/dotty:2019-09-19
   depends_on: [ clone ]
   commands:
   - cp -R . /tmp/4/ && cd /tmp/4/
@@ -67,7 +67,7 @@ steps:
 
 - name: test_java11
   pull: default
-  image: lampepfl/dotty:2019-09-10
+  image: lampepfl/dotty:2019-09-19
   depends_on: [ clone ]
   commands:
   - export PATH="/usr/lib/jvm/java-11-openjdk-amd64/bin:$PATH"
@@ -81,7 +81,7 @@ steps:
 
 - name: documentation
   pull: default
-  image: lampepfl/dotty:2019-09-10
+  image: lampepfl/dotty:2019-09-19
   depends_on:
   - test
   - test_bootstrapped
@@ -100,7 +100,7 @@ steps:
 
 - name: publish_nightly
   pull: default
-  image: lampepfl/dotty:2019-09-10
+  image: lampepfl/dotty:2019-09-19
   depends_on:
   - test
   - test_bootstrapped
@@ -127,7 +127,7 @@ steps:
 
 - name: publish_release
   pull: default
-  image: lampepfl/dotty:2019-09-10
+  image: lampepfl/dotty:2019-09-19
   depends_on:
   - test
   - test_bootstrapped
@@ -170,7 +170,7 @@ steps:
 
 - name: publish_sbt_release
   pull: default
-  image: lampepfl/dotty:2019-09-10
+  image: lampepfl/dotty:2019-09-19
   depends_on:
   - test
   - test_bootstrapped