Bump platformio from 5.1.0 to 5.1.1

[dependabot]

Bumps platformio from 5.1.0 to 5.1.1.

Release notes

Sourced from platformio's releases.

5.1.1

• Fixed a "The command line is too long" issue with a linking process on Windows ([issue #3827](platformio/platformio-core#3827))
• Fixed an issue with device monitor when the "send_on_enter" filter didn't send EOL chars ([issue #3787](platformio/platformio-core#3787))
• Fixed an issue with silent mode when unwanted data is printed to stdout ([issue #3837](platformio/platformio-core#3837))
• Fixed an issue when code inspection fails with "Bad JSON" ([issue #3790](platformio/platformio-core#3790))
• Fixed an issue with overriding user-specified debugging configuration information in VSCode ([issue #3824](platformio/platformio-core#3824))

Changelog

Sourced from platformio's changelog.

5.1.1 (2021-03-17)

* Fixed a "The command line is too long" issue with a linking process on Windows (`issue [#3827](https://github.com/platformio/platformio/issues/3827) <https://github.com/platformio/platformio-core/issues/3827>`_)
* Fixed an issue with `device monitor <https://docs.platformio.org/page/core/userguide/device/cmd_monitor.html>`__ when the "send_on_enter" filter didn't send EOL chars (`issue [#3787](https://github.com/platformio/platformio/issues/3787) <https://github.com/platformio/platformio-core/issues/3787>`_)
* Fixed an issue with silent mode when unwanted data is printed to stdout (`issue [#3837](https://github.com/platformio/platformio/issues/3837) <https://github.com/platformio/platformio-core/issues/3837>`_)
* Fixed an issue when code inspection fails with "Bad JSON" (`issue [#3790](https://github.com/platformio/platformio/issues/3790) <https://github.com/platformio/platformio-core/issues/3790>`_)
* Fixed an issue with overriding user-specified debugging configuration information in VSCode (`issue [#3824](https://github.com/platformio/platformio/issues/3824) <https://github.com/platformio/platformio-core/issues/3824>`_)

Commits

• d2ae333 Merge branch 'release/v5.1.1'
• 18b18f1 Bump version to 5.1.1
• edf724d Sync docs
• 622a190 Avoid "rustup" when building cryptography for contrib-pysite // Resolve #3865
• 5b4a78b Bump version to 5.1.1b1
• 44b85f6 Switch Cppcheck to analyze project per file // Issue #3797
• 7f1f760 Preserve user-specified debug configurations in VSCode integration (#3878)
• 54d8c96 Update SPDX license list to 3.12
• c6ab782 Fixed incorrect size of unnecessary data // Resolve #3830
• ae26079 Fixed an issue when code inspection fails with "Bad JSON" // Resolve #3790
• Additional commits viewable in compare view

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[dependabot]

Looks like platformio is up-to-date now, so this is no longer needed.