chore: update tgf to 3.26 (required) - cli [CA-397] (#1267)

### [CA-397: Update projects to tgf 3.26 to support new paired region
variable](https://coveord.atlassian.net/browse/CA-397)
### Context
In order to be prepared for deployment in new regions, this tgf update
is required.

✅ Your repository has been identified as a no risk update as the only
changes are to attributes/resources known to be harmless

### Solution
Bump tgf to required version

### Check list
- [x] Tests ([You can review the plan before/after
changes](https://github.com/coveo/tgf-plan-diff/pull/301/files))

Co-authored-by: Louis Bompart <[email protected]>

terraform/.tgf.config

@@ -1 +1 @@
-docker-image-version: 3.25
+docker-image-version: 3.26