Bump Microsoft.Extensions.Logging.Abstractions from 3.1.6 to 3.1.8 in /src

[dependabot[bot]]

Bumps Microsoft.Extensions.Logging.Abstractions from 3.1.6 to 3.1.8.

Release notes

Sourced from Microsoft.Extensions.Logging.Abstractions's releases.

.NET Core 3.1.8

• Release Notes
• Download and Install

Repos

• CLI
• CoreCLR
• Core-Setup
• ASP
• Extensions
• ASPNETCORE-Tooling
• Toolset
• SDK
• EF Core
• WPF
• Winforms

.NET Core 3.1.7

• Release Notes
• Download and Install

Repos

• CLI
• CoreCLR
• Core-Setup
• ASP
• Extensions
• ASPNETCORE-Tooling
• Toolset
• SDK
• EF Core
• WPF
• Winforms

Commits

• 1774c15 Update dependencies from https://github.com/dotnet/core-setup build 20200820....
• 1866984 Update dependencies from https://github.com/dotnet/core-setup build 20200819....
• 28235e4 Update dependencies from https://github.com/dotnet/core-setup build 20200819....
• 6dbf099 Update dependencies from https://github.com/dotnet/core-setup build 20200819....
• bb7e14d Update dependencies from https://github.com/dotnet/core-setup build 20200819....
• 467073e [release/3.1] Correct SHA to align w/ 3.1.6 core-setup release commit (#3425)
• 040097b [release/3.1] Update dependencies from dotnet/core-setup (#3423)
• 63c6df0 [release/3.1] Downgrade packages when building ref/ projects (#3424)
• a741555 [release/3.1] Add dependencies for CPD strict in aspnetcore (#3417)
• e5aad5e Update dependencies from https://github.com/dotnet/core-setup build 20200815....
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[dependabot[bot]]

Looks like Microsoft.Extensions.Logging.Abstractions is up-to-date now, so this is no longer needed.