ci: use embedded Java for Bazel coverage

.github/bin/build-and-test.sh

diff --git a/.github/bin/build-and-test.sh b/.github/bin/build-and-test.sh
index f059ac7..f0910c7 100755
--- a/.github/bin/build-and-test.sh
+++ b/.github/bin/build-and-test.sh
@@ -94,6 +94,7 @@
     bazel coverage \
           --combined_report=lcov \
           --coverage_report_generator=@bazel_tools//tools/test/CoverageOutputGenerator/java/com/google/devtools/coverageoutputgenerator:Main \
+          --java_runtime_version=remotejdk_11 \
           ${CHOSEN_TARGETS}
     # output will be in bazel-out/_coverage/_coverage_report.dat
     ;;