Bump Microsoft.AspNetCore.All from 2.1.6 to 2.1.15 in /DarkStatsCore

[dependabot[bot]]

Bumps Microsoft.AspNetCore.All from 2.1.6 to 2.1.15.

Release notes

Sourced from Microsoft.AspNetCore.All's releases.

.NET Core 2.1.15

• Release Notes
• Download and Install

Repos

• Core
• CoreCLR
• CoreFX
• ASP
• Core-Setup
• CLI - 2.1.803
• CLI - 2.1.608
• CLI - 2.1.511

.NET Core 2.1.14

• Release Notes
• Download and Install

Repos

• Core
• CoreCLR
• ASP
• CLI - 2.1.510
• CLI - 2.1.607

.NET Core 2.1.13

• Release Notes
• Download and Install

Repos

• Core
• CoreCLR
• CoreFX
• Core-Setup
• CLI
• CLI
• CLI
• ASP

.NET Core 2.1.12

• Release Notes
• Download and Install

Repos

• Core
• CoreCLR
• CoreFX
• Core-Setup
• CLI
• ASP

Commits

• 163c80c Merge in 'release/2.1' changes
• 049cdec Unpin package (#17536)
• 0757955 Merged PR 2918: Cancel Sends if they take too long
• 147f950 Update branding to 2.1.15 (#17273)
• 57e68b0 Merged PR 3557: Revert "Wait to Complete Pipe"
• 7fd42c4 Merged PR 3115: Wait to Complete Pipe
• f198e55 [2.1] Re-implement SameSite for 2019 (#13746)
• a9fb7f4 Get latest from EntityFrameworkCore for 2.1.14
• 82c42d5 Update branding to 2.1.14
• 1fe84a6 Replace obsolete feeds
• Additional commits viewable in compare view

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