swift-collections 1.1.3 adoption

[glessard]

Update the swift-collections dependency to use version 1.1.3.

This bug fix update fixes:

• a performance bug in BigString which affects swift-foundation (https://github.com/apple/swift-collections/pull/405), rdar://131176282
• Deque.Iterator's Sendable conformance.

This is an augmented cherry-pick of https://github.com/swiftlang/swift/pull/76101 (adds updates to the 6.0 and 6.0.1 branches).

[glessard]

@swift-ci please test

[glessard]

@swift-ci please build toolchain

[shahmishal]

Swift 6.0.2 has been released.