Update golang toolchain

[henry118]

Go 1.25 is EOL.

• Bump the minimum required toolchain to 1.26
• Bump CI version (build/test/release) to 1.27

[coveralls]

Coverage Report for CI Build 32516771210

Coverage decreased (-0.4%) to 43.69%

Details

• Coverage decreased (-0.4%) from the base build.
• Patch coverage: 2 uncovered changes across 2 files (1 of 3 lines covered, 33.33%).
• 5 coverage regressions across 5 files.

Uncovered Changes

File	Changed	Covered	%
cmd/nvidia-cdi-hook/cudacompat/cudacompat.go	2	1	50.0%
pkg/nvcdi/driver-wsl.go	1	0	0.0%

Coverage Regressions

5 previously-covered lines in 5 files lost coverage.

File	Lines Losing Coverage	Coverage
cmd/nvidia-ctk-installer/toolkit/toolkit.go	1	40.51%
cmd/nvidia-ctk/runtime/configure/configure.go	1	71.83%
internal/platform-support/dgpu/dgpu.go	1	69.88%
pkg/system/nvdevices/devices.go	1	76.67%
pkg/system/nvmodules/modules.go	1	89.74%

---

Coverage Stats

Relevant Lines:	13415
Covered Lines:	5861
Line Coverage:	43.69%
Coverage Strength:	0.44 hits per line

---

💛 - Coveralls

[henry118]

/cherry-pick release-1.20

[github-actions]

🤖 Backport PR created for release-1.20: #2024 ⚠️ (has conflicts)