Release 1.1.0 rc1

[jdolitsky]

Candidate commits for releasing 1.1.0-rc1 and switch back to dev and bump main branch version to 1.1.0-dev

This follows precedence similar to - https://github.com/opencontainers/distribution-spec/pull/274/commits

Tied to https://github.com/opencontainers/image-spec/pull/953

34 PRs merged since last release (v1.0.0):

git log --oneline --merges 13bd083...1dfa4f4 | sed '$ d' |  \
  sed 's/.*Merge pull request //' | grep -v 'GHSA' | awk '{print "- " $1}' | uniq

• 346

• 342

• 344

• 341

• 345

• 339

• 335

• 318

• 336

• 333

• 322

• 326

• 293

• 313

• 111

• 310

• 309

• 311

• 308

• 304

• 300

• 296

• 297

• 295

• 294

• 288

• 226

• 284

• 286

• 285

• 283

• 275

• 280

• 256

[sudo-bmitch]

Should this only track PR's since the 1.0.1 release, instead of the 1.0.0 release?

$ git log v1.0.1..HEAD --oneline --merges | sed '$ d' |    sed 's/.*Merge pull request //' | grep -v 'GHSA' | awk '{print "- " $1}' | uniq