gitlab-ci: Extend timeout for ubuntu-20.04-s390x-all to 75m

Recent runs have been taking just over the 60m default.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606182436.410053-1-richard.henderson@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>

.gitlab-ci.d/custom-runners/ubuntu-20.04-s390x.yml

@@ -31,6 +31,7 @@ ubuntu-20.04-s390x-all:
  - s390x
  variables:
     DFLTCC: 0
+ timeout: 75m
  rules:
  - if: '$CI_PROJECT_NAMESPACE == "qemu-project" && $CI_COMMIT_BRANCH =~ /^staging/'
  - if: "$S390X_RUNNER_AVAILABLE"