OutputCaching middleware memory leak

[narcis-ro]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

OutputCacheEntry is renting an ArrayPool that never gets returned to the pool, in method: CopyHeadersFrom

aspnetcore/src/Middleware/OutputCaching/src/OutputCacheEntry.cs

Line 105 in b7fcd33

Headers = new(arr, 0, index);

P.S the dispose is empty and is never released in any other place

Expected Behavior

ArrayPool rented should be returned

Steps To Reproduce

Normal usage of Output caching, behavior happens if there are headers to cache

Exceptions (if any)

No response

.NET Version

No response

Anything else?

No response

[narcis-ro]

Could also be related: #55890

[BrennanConroy]

@mgravell

Could also be related: #55890

Don't know what that issue is about, but can't be related as the PinnedBlockMemoryPool and ArrayPool are completely different.