chore(deps): update dependency go to 1.26 (#753)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [go](https://redirect.github.com/actions/go-versions) | uses-with |
minor | `1.25` → `1.26` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the warning logs for
more information.

---

### Release Notes

<details>
<summary>actions/go-versions (go)</summary>

###
[`v1.26.0`](https://redirect.github.com/actions/go-versions/releases/tag/1.26.0-21889650668):
1.26.0

[Compare
Source](https://redirect.github.com/actions/go-versions/compare/1.25.7-21696103256...1.26.0-21889650668)

Go 1.26.0

</details>

---

### Configuration

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Author: canonical-iam

.github/workflows/codeql-analysis.yaml

@@ -53,7 +53,7 @@ jobs:
 
     - uses: actions/setup-go@7a3fe6cf4cb3a834922a1244abfce67bcef6a0c5 # v6
       with:
-        go-version: '1.25' 
+        go-version: '1.26' 
 
         # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)

.github/workflows/tiobe.yaml

@@ -17,7 +17,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@7a3fe6cf4cb3a834922a1244abfce67bcef6a0c5 # v6
         with:
-          go-version: '1.25'
+          go-version: '1.26'
       - uses: actions/setup-node@6044e13b5dc448c55e2357c09f80417699197238 # v6
         with:
           node-version: 24

.github/workflows/unittest.yaml

@@ -10,7 +10,7 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - uses: actions/setup-go@7a3fe6cf4cb3a834922a1244abfce67bcef6a0c5 # v6
         with:
-          go-version: '1.25'
+          go-version: '1.26'
       - uses: actions/setup-node@6044e13b5dc448c55e2357c09f80417699197238 # v6
         with:
           node-version: 24