travis: switch to ubuntu focal, which is shipped with ruby 2.7 rather…

… than 3.0 on jammy. the github releases dpl provided is incompatible with ruby 3 (travis-ci/dpl#1234)
harababurel · Jul 24, 2023 · abdfbfc · abdfbfc
1 parent 3bcc383
commit abdfbfc
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/.travis.yml b/.travis.yml
@@ -1,4 +1,4 @@
-dist: jammy
+dist: focal
 language: rust
 sudo: required
 rust: