golang: bump to 1.25.6

[smallprogram]

📦 Package Details

Maintainer: @jefferyto, @1715173329
_{(You can find this by checking the history of the package Makefile.)}

Description:

golang: bump to 1.25.6
Fixes: CVE-2025-61726
Fixes: CVE-2025-61728
Fixes: CVE-2025-61730
Fixes: CVE-2025-61731
Fixes: CVE-2025-68119
Fixes: CVE-2025-68121
Link：https://github.com/golang/go/issues?q=milestone%3AGo1.25.6+label%3ACherryPickApproved

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🧪 Run Testing Details

• OpenWrt Version: SNAPSHOT
• OpenWrt Target/Subtarget: x86/64
• OpenWrt Device: QEMU

---

✅ Formalities

• I have reviewed the CONTRIBUTING.md file for detailed contributing guidelines.

[GeorgeSapkin]

You need to follow the submissions guidelines regarding the commit message. Check previous golang version bump commits to see what's usually included.

[smallprogram]

You need to follow the submissions guidelines regarding the commit message. Check previous golang version bump commits to see what's usually included.

request review

[GeorgeSapkin]

You didn't change anything about the commit.

[smallprogram]

You didn't change anything about the commit.

done

[GeorgeSapkin]

Please add a list of all CVEs fixed in the release based on the release notes in the mailing list using the format from previous commits.

[GeorgeSapkin]

Don't add links to CVEs, CVE ID is enough. Sort CVEs by ID lexicographically. Prefix the milestone URL with Link: instead. Remove the empty line between the last link and sign-off. And commit message lines should be 75 characters long max. Please read the submission guidelines.