Remove Guava 30.1.1 from `third_party`.

We recently updated to Guava 31 and the old binaries are no longer used.

Closes #14375.

Signed-off-by: Philipp Wollermann <philwo@google.com>

third_party/guava/guava-30.1.1-jre.jar

diff --git a/third_party/guava/guava-30.1.1-jre.jar b/third_party/guava/guava-30.1.1-jre.jar
deleted file mode 100644
index 93ebf3b..0000000
--- a/third_party/guava/guava-30.1.1-jre.jar
+++ /dev/null
Binary files differ

third_party/guava/guava-testlib-30.1.1-jre.jar

diff --git a/third_party/guava/guava-testlib-30.1.1-jre.jar b/third_party/guava/guava-testlib-30.1.1-jre.jar
deleted file mode 100644
index 538b4c9..0000000
--- a/third_party/guava/guava-testlib-30.1.1-jre.jar
+++ /dev/null
Binary files differ