docs: add release notes for 21.2.3

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+Mesa 21.2.3 Release Notes / 2021-09-29
+======================================
+
+Mesa 21.2.3 is a bug fix release which fixes bugs found since the 21.2.2 release.
+
+Mesa 21.2.3 implements the OpenGL 4.6 API, but the version reported by
+glGetString(GL_VERSION) or glGetIntegerv(GL_MAJOR_VERSION) /
+glGetIntegerv(GL_MINOR_VERSION) depends on the particular driver being used.
+Some drivers don't support all the features required in OpenGL 4.6. OpenGL
+4.6 is **only** available if requested at context creation.
+Compatibility contexts may report a lower version depending on each driver.
+
+Mesa 21.2.3 implements the Vulkan 1.2 API, but the version reported by
+the apiVersion property of the VkPhysicalDeviceProperties struct
+depends on the particular driver being used.
+
+SHA256 checksum
+---------------
+
+::
+
+    TBD.
+
+
+New features
+------------
+
+- None
+
+
+Bug fixes
+---------
+
+- Significant performance drop on Radeon HD 8400
+- [nir][radv] Out of range shift when compiling Resident Evil Village shaders
+- [nir][radv] Out of range shift when compiling Resident Evil Village shaders
+- GL_EXT_disjoint_timer_query glGetInteger64v GL_TIMESTAMP failing with GL_INVALID_ENUM
+- Possible miscompilation of an integer division with vulkan
+
+
+Changes
+-------
+
+Boris Brezillon (3):
+
+- panfrost: RGB10_A2_SNORM is not a valid texture format on v6+
+- panfrost: RGB332_UNORM is not a valid texture format on v6+
+- pan/blit: Fix a NULL dereference in the preload path
+
+Charmaine Lee (1):
+
+- svga: fix render target views leak
+
+Dylan Baker (15):
+
+- docs/relnotes/21.2.2: Add SHA256 sum
+- .pick_status.json: Update to d3511e8af21ac11b8e7f5305942624d1ae29a73a
+- .pick_status.json: Mark a79ac1bee14d6600cde2788bf136aa59b69a786f as backported
+- .pick_status.json: Mark e0533ebf16edcb8b9f0687d3155417e6c1c53d35 as backported
+- .pick_status.json: Mark f241bd3749cec55ca5fac9cb24f17553ab31c0e1 as backported
+- .pick_status.json: Mark 268158a758551a46feb120af3f3cff5fb9292310 as backported
+- .pick_status.json: Mark 6373dd814a74d84becbbbfc42673df147adb6e9b as denominated
+- .pick_status.json: Mark eb7d2ef070a8819c2859c10559496836275848e2 as denominated
+- .pick_status.json: Mark a810e58051b4a065b0aade86c45bf7ed254fc726 as denominated
+- .pick_status.json: Update to 400da4900e2d72ee807cc3eedac9ace1dfd5dfba
+- .pick_status.json: Update to dc354b8fda928861b7dfff3f8f53159e0053f9f5
+- .pick_status.json: Update to b653164973bbd3053d3b9ed37c4362af96346900
+- .pick_status.json: Update to ecc6d78b0541d66765d434dd4158066d6c664f8e
+- .pick_status.json: Update to fbbe00c0b7f7aa5aca42a82358332eb2de56b9af
+- lavapipe/ci: Add additional failing test
+
+Ella-0 (1):
+
+- v3d: add R10G10B10X2_UNORM to format table
+
+Emma Anholt (1):
+
+- mesa: Fix missing CopyTexImage formats for OES_required_internalformat.
+
+Italo Nicola (1):
+
+- panfrost: fix null deref when no color buffer is attached
+
+Jordan Justen (2):
+
+- iris: Disable I915_FORMAT_MOD_Y_TILED_GEN12* on adl-p/display 13
+- intel/dev: Add display_ver and set adl-p to 13
+
+Lionel Landwerlin (1):
+
+- nir: fix opt_memcpy src/dst mixup
+
+Marcin Ślusarz (1):
+
+- intel/compiler: INT DIV function does not support source modifiers
+
+Marek Olšák (2):
+
+- radeonsi: fix a depth texturing performance regression on gfx6-7
+- radeonsi: fix clearing index_size for NGG fast launch
+
+Marek Vasut (1):
+
+- freedreno: Handle timeout == PIPE_TIMEOUT_INFINITE and rollover
+
+Neha Bhende (1):
+
+- auxiliary/indices: convert primitive type PIPE_PRIM_PATCHES
+
+Qiang Yu (1):
+
+- radeonsi: fix ps SI_PARAM_LINE_STIPPLE_TEX arg
+
+Rhys Perry (3):
+
+- aco: don't coalesce constant copies into non-power-of-two sizes
+- aco/tests: add idep_amdgfxregs_h
+- radv: don't require a GS copy shader to use the cache with NGG VS+GS
+
+Rob Clark (2):
+
+- freedreno: Use correct key for binning pass shader
+- freedreno/drm: Don't return shared/control bo's to cache
+
+Tapani Pälli (1):
+
+- mesa: fix timestamp enum with EXT_disjoint_timer_query
+
+Timur Kristóf (5):
+
+- aco/optimize_postRA: Use iterators instead of operator[] of std::array.
+- ac/nir: Fix match_mask to work correctly for VS outputs.
+- nir: Exclude non-generic patch variables from get_variable_io_mask.
+- ac/nir/nggc: Refactor save_reusable_variables.
+- ac/nir/nggc: Don't reuse uniform values from divergent control flow.
+
+Zachary Michaels (1):
+
+- X11: Ensure that VK_SUBOPTIMAL_KHR propagates to user code