chore(deps): update ghcr.io/qdm12/gluetun docker tag to v3.40.3

[renovate]

This PR contains the following updates:

Package	Update	Change
ghcr.io/qdm12/gluetun	patch	v3.40.1 -> v3.40.3

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Release Notes

qdm12/gluetun (ghcr.io/qdm12/gluetun)

v3.40.3

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Fixes

• Fixed previous fix on ProtonVPN: credentials are not required to be set.

v3.40.2

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Fixes

• DNS: fix DNS_KEEP_NAMESERVER behavior
  • no longer hangs the code when establishing the VPN connection
  • no longer makes Gluetun panic when exiting
• ProtonVPN:
  • updater authentication fixed for some accounts
    • If updating servers data periodically, use UPDATER_PROTONVPN_EMAIL instead of UPDATER_PROTONVPN_USERNAME (retrocompatibility maintained)
    • If using the CLI, use -proton-email instead of -proton-username (retrocompatibility maintained)
  • ProtonVPN servers data updated to include paid servers
• Servers storage: do not crash the container but log a warning if flushing merged servers to file fails

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