Update NEWS and release process

[kevinAlbs]

Summary

• Update the NEWS following the 1.27.5 release.
• Specify amd64 platform for snyk-monitor-snapshot target to ensure downloaded snyk binary matches container architecture.
• Remove Homebrew steps from release.

Background & Motivation

Specifying the amd64 platform on the snyk-monitor-snapshot target is intended to address an error observed during the release:

================================== ❌ FAILURE ===================================

+snyk-monitor-snapshot *failed* | Repeating the failure error...
+snyk-monitor-snapshot *failed* | branch=r1.27 name=release-1.27.5
+snyk-monitor-snapshot *failed* | --> RUN --no-cache snyk monitor --org=$SNYK_ORGANIZATION --target-reference=$name --unmanaged --print-deps --project-name=mongo-c-driver --remote-repo-url=https://github.com/mongodb/mongo-c-driver
+snyk-monitor-snapshot *failed* | qemu-x86_64: Could not open '/lib64/ld-linux-x86-64.so.2': No such file or directory
+snyk-monitor-snapshot *failed* | ERROR Earthfile line 394:4
+snyk-monitor-snapshot *failed* |       The command
+snyk-monitor-snapshot *failed* |           RUN --no-cache snyk monitor --org=$SNYK_ORGANIZATION --target-reference=$name --unmanaged --print-deps --project-name=mongo-c-driver --remote-repo-url=https://github.com/mongodb/mongo-c-driver
+snyk-monitor-snapshot *failed* |       did not complete successfully. Exit code 255

I expect this was due to me running on macOS M1 (arm64). The downloaded Snyk binary is for amd64.

Homebrew steps are removed due to no longer appearing to be necessary:

% brew bump-formula-pr mongo-c-driver --url https://github.com/mongodb/mongo-c-driver/archive/refs/tags/1.27.5.tar.gz
Error: Whoops, the mongo-c-driver formula has its version update
pull requests automatically opened by BrewTestBot every ~3 hours!
We'd still love your contributions, though, so try another one
that's not in the autobump list:
  https://github.com/Homebrew/homebrew-core/blob/master/.github/autobump.txt