[Release] Bump version to 1.76.0 (on v1.76.x branch) (#40925)

Change was created by the release automation script. See
go/grpc-release.

[Release] Bump version to 1.76.0-pre1 (on v1.76.x branch) (#40798)

Change was created by the release automation script. See
go/grpc-release.

[Backport][v1.75.x][Fix] PHP macOS build: composer sha sum update, ha…

…rden install script (#40772)

Backport of #40769 to v1.75.x.
---
Composer sha sum updated, see https://composer.github.io/pubkeys.html

> Installer Checksum (SHA-384)
`ed0feb545ba87161262f2d45a633e34f591ebb3381f2e0063c345ebea4d228dd0043083717770234ec00c5a9f9593792`
> Last Updated: 2025-09-18

Also hardens the install script.

Co-authored-by: Sergii Tkachenko <sergiitk@google.com>

[build] Fix objc boringssl build backport (#40689)

Backport #40688 to `v1.75.x` branch

[Security] Cherry Pick Spiffe Verification (#40515)

Cherry pick #40476 to 1.75

RELEASE NOTES:
* Adds support for SPIFFE Bundle Maps in as roots of trust per [gRFC
A87](https://github.com/grpc/proposal/blob/master/A87-mtls-spiffe-support.md)
and grpc/proposal#506

[release] Bump release version on 1.74 to 1.74.1 (#40400)

To release #40397

[Release] Bump version to 1.74.0 (on v1.74.x branch) (#40290)

Change was created by the release automation script. See go/grpc-release

[ruby] bump timeout for ruby artifact build on 1.74.x branch (#40230)

backport #40229

[Backport][v1.74.x][event_engine] Fix race conditions in the timer ma…

…nager shutdown (#40147)

[Release] Bump version to 1.72.2 (on v1.72.x branch) (#40018)

Change was created by the release automation script. See
go/grpc-release.