Update mobc requirement from 0.7 to 0.8 in /gremlin-client

[dependabot[bot]]

Updates the requirements on mobc to permit the latest version.

Release notes

Sourced from mobc's releases.

0.8.1

Update readme typo's and update mobc-redis and mobc-postgres deps to use 0.8

Changelog

Sourced from mobc's changelog.

v0.8.1

• Fix typo's in readme
• Update mobc-postgres and mobc-redis to use latest version

v0.8.0

• Replaces channels with Sempahores
• Adds metrics

v0.7.3 2021-6-25

• Support the actix-rt v1.0.

v0.7.2 2021-4-2

• Retry when connection check fails on checkout

v0.7.1 2021-3-12

• Optimize the internal get requests queue.

v0.7.0 2021-1-19

• Compatible with Tokio 1.0

v0.5.12 2020-07-08

• Add a new method into_inner to connection to unwrap the raw connection.

v0.5.11 2020-6-17

• Upgrade the future-timer.

v0.5.10 2020-6-3

• Add a sync hook validate in the Manager trait to quickly determine connections are still valid when check-in

v0.5.9 2020-6-3

• Fix get timeout.

v0.5.8(yanked) 2020-6-1

• Add a hook to determine connections are valid when check-in.

v0.5.7 2020-03-28

• Fix PANIC: overflow when subtracting duration from instant.

... (truncated)

Commits

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[wolf4ood]

@dependabot rebase

[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.