Prepare v1.6.1: Update CHANGELOG (#6094)

## Motivation

Add information of changes since v1.6.0.

.github/workflows/ci.yml

@@ -44,10 +44,10 @@ jobs:
       - uses: dorny/paths-filter@v3
         id: filter
         with:
-          # this pattern matches using picomatch syntax (used by this third party Action), which is slightly
-          # different than GitHub syntax: it matches any file in any path ending in '.md'. this checks if
-          # any non-markdown files were changed. Additionally changing the CODEOWNERS file should not trigger
-          # a full CI run.
+          # All patterns have to match for it to be considered a non-doc change.
+          # If only markdown files or CODEOWNERS are changed non-doc will be considered true and not trigger
+          # building the code and executing the tests.
+          predicate-quantifier: 'every'
           filters: |
             nondoc:
               - '!**/*.md'

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 See [RELEASE](./RELEASE.md) for workflow instructions.
 
+## Release v1.6.1
+
+### Improvements
+
+* [#6053](https://github.com/spacemeshos/go-spacemesh/pull/6053) Fixed an issue where the node could fail to select a
+  positioning ATX during the cyclegap and miss the registration window for the next PoET round.
+
 ## Release v1.6.0
 
 ### Upgrade information