[#715] Stop bottle support for Big Sur

Problem: Big Sur is deprecated by Apple.

Solution: Stop bottle support for Big Sur.

.buildkite/pipeline-for-tags.yml

@@ -117,42 +117,3 @@ steps:
    - mkdir -p srcs
    - buildkite-agent artifact download "epel/*" srcs --step sign-source-packages-built-from-static-binaries
    - nix develop .#buildkite -c ./docker/build/fedora/upload.py -d srcs/epel --upload epel
-
- - label: Build Big Sur x86_64 bottles
-   key: build-bottles-big-sur-x86_64
-   if: build.tag =~ /^v.*/
-   agents:
-     queue: "x86_64-rosetta-darwin"
-   commands:
-   - nix develop .#autorelease-macos -c ./scripts/build-all-bottles.sh "big_sur"
-   artifact_paths:
-     - '*.bottle.*'
-   retry:
-     automatic:
-       limit: 1
-
- - label: Build Big Sur arm64 bottles
-   key: build-bottles-big-sur-arm64
-   if: build.tag =~ /^v.*/
-   agents:
-     queue: "arm64-darwin"
-   commands:
-   - nix develop .#autorelease-macos -c ./scripts/build-all-bottles.sh "arm64_big_sur"
-   artifact_paths:
-     - '*.bottle.*'
-   retry:
-     automatic:
-       limit: 1
-
- # We use the tag that triggered the pipeline here.
- # However, this requires that the tag and the release name are the same, which
- # in practice it's always the case in this repo.
- - label: Add Big Sur bottle hashes to formulae
-   depends_on:
-   - "build-bottles-big-sur-arm64"
-   - "build-bottles-big-sur-x86_64"
-   if: build.tag =~ /^v.*/
-   commands:
-   - mkdir -p "Big Sur"
-   - nix develop .#buildkite -c gh release download "$BUILDKITE_TAG" -D "Big Sur/" -p "*big_sur.bottle.tar.gz"
-   - nix develop .#autorelease -c ./scripts/sync-bottle-hashes.sh "$BUILDKITE_TAG" "Big Sur"

docs/support-policy.md

@@ -45,12 +45,10 @@ There are packages for `x86_64` and `aarch64` architectures.
 ## macOS brew formulae
 
 Brew formulae provided by `tezos-packaging` aim to support all maintained macOS versions, currently:
-* macOS 11 (Big Sur)
 * macOS 12 (Monterey)
 * macOS 13 (Ventura)
 
 Unfortunately, the ability to provide pre-compiled brew bottles for formulae has
 a hard dependency on the available build infrastructure.
 Thus we currently only provide brew bottles for these two macOS versions:
-* macOS 11 (Big Sur) both `x86_64` and `arm64`
 * macOS 12 (Monterey) `x86_64` only