build(deps): bump matplotlib from 3.0.2 to 3.0.3

[dependabot-preview[bot]]

Bumps matplotlib from 3.0.2 to 3.0.3.

Commits

- [`93990ab`](https://github.com/matplotlib/matplotlib/commit/93990abc5c6917a6a82d966ce1a4380d30370b00) REL: v3.0.3 - [`efc41b8`](https://github.com/matplotlib/matplotlib/commit/efc41b8356c87228fe47d9c3be6b628eaa851150) Merge pull request [#13493](https://github-redirect.dependabot.com/matplotlib/matplotlib/issues/13493) from tacaswell/v3.0.x-pi - [`fb98f47`](https://github.com/matplotlib/matplotlib/commit/fb98f47a7b1adad1b8c3500a71dbecdd1f6aba05) DOC: fix heading level - [`4087e7d`](https://github.com/matplotlib/matplotlib/commit/4087e7d76e75120f910606073f9f37e58e5be176) DOC: move the whats_new back to top level - [`9ce17e3`](https://github.com/matplotlib/matplotlib/commit/9ce17e3a84925685435ce32e51968898b5b03772) DOC: move the api changes back - [`a8933ef`](https://github.com/matplotlib/matplotlib/commit/a8933ef6e9b9b04277fac5036b3f287d96462815) Merge remote-tracking branch 'origin/v3.0.2-doc' into v3.0.x-pi - [`8d187df`](https://github.com/matplotlib/matplotlib/commit/8d187df13f48c4222b2f1c9f4be0fbb2ed8e1ac0) Merge pull request [#13476](https://github-redirect.dependabot.com/matplotlib/matplotlib/issues/13476) from chrjen/patch-1 - [`31d5269`](https://github.com/matplotlib/matplotlib/commit/31d526973538f3fdababd0ab81b72c007279a2ec) DOC: api changes, what's new, stats for 3.0.3 - [`7ce0def`](https://github.com/matplotlib/matplotlib/commit/7ce0def85197c8d88db062b58dd32ad21ecf4ef3) BLD: make gh_api and github_stats more robust - [`069a056`](https://github.com/matplotlib/matplotlib/commit/069a056934af5db27c7784a1c6bfdbf52b0f88f8) Add font to pyplot.xkcd() - Additional commits viewable in [compare view](https://github.com/matplotlib/matplotlib/compare/v3.0.2...v3.0.3)

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[dependabot-preview[bot]]

Superseded by #147.