build(deps): bump Externals/libogg from `cab46b1` to `31bd3f2`

Created by: dependabot-preview[bot]

Bumps Externals/libogg from cab46b1 to 31bd3f2.

Commits

• 31bd3f2 autotools: remove trailing whitespace in configure.ac.
• 5f2e7a9 configure.ac: replace -O20 optimization flags with -O2.
• 36f969b Export CMake targets to the build tree
• 684c737 framing: check for overflow on growing buffer
• 0bbcba4 Fix link in ogg_stream_clear documentation.
• 5fb070b Fix link in ogg_stream_init documentation
• 1e8d7cc Use the default key for gitab-ci config.
• a4208e5 Use the gcc:9 image for gitlab-ci builds.
• 0f1b698 Add gitlab integration tests.
• fc92469 Remove symbian build files.
• Additional commits viewable in compare view

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