Prepare v1.1.2 release (#4898)

## Motivation
Prepares a new release: v1.1.2

## Changes
- Update RELEASE.md
- After merge: rebase `v1.1` branch and tag `v1.1.2`

## Test Plan
n/a

## TODO
<!-- This section should be removed when all items are complete -->
- [x] Explain motivation or link existing issue(s)
- [x] Test changes and document test plan
- [x] Update documentation as needed

## DevOps Notes
<!-- Please uncheck these items as applicable to make DevOps aware of changes that may affect releases -->
- [x] This PR does not require configuration changes (e.g., environment variables, GitHub secrets, VM resources)
- [x] This PR does not affect public APIs
- [x] This PR does not rely on a new version of external services (PoET, elasticsearch, etc.)
- [x] This PR does not make changes to log messages (which monitoring infrastructure may rely on)

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 See [RELEASE](./RELEASE.md) for workflow instructions.
 
-## UNRELEASED
+## v1.1.2
 
 ### Upgrade information
 
@@ -65,3 +65,4 @@ Doesn't affect direct peers. In order to disable:
 
 * [#4882](https://github.com/spacemeshos/go-spacemesh/pull/4882) Increase cache size and parametrize datastore.
 * [#4887](https://github.com/spacemeshos/go-spacemesh/pull/4887) Fixed crashes on API call.
+* [#4871](https://github.com/spacemeshos/go-spacemesh/pull/4871) Add jitter to spread out requests to get poet proof and submit challenge

RELEASE.md

@@ -23,3 +23,19 @@ Cherry-pick selected commits to major release branch.
 Copy selected commits to CHANGELOG.md.
 Rename UNRELEASED to a concrete <version>.
 Commit changes, and create a tag.
+
+## Preparing for next release
+
+After releasing a new major or minor version, create a new UNRELEASED section at the top of CHANGELOG.md:
+
+```markdown
+## UNRELEASED
+
+### Upgrade information
+
+### Highlights
+
+### Features
+
+### Improvements
+```