Bump to v1.10.7+astro.10 (BackPort Secrets Backend)

[kaxil]

Changelog between v1.10.7+astro.9 and v1.10.7+astro.10:

Backported all the Secrets Backend commits.

d1c5fdc Store info about the latest version in the series (#487)
f47108f Build DEV packages on each commit if it is not a tag
d9d0335 Bump to v1.10.7.dev1+astro.10
d6d666c Allow setting Airflow Variable values to empty string ('') (apache#8021)
6a7130f Get Airflow Variables from AWS Systems Manager Parameter Store (apache#7945)
595ede5 Get Airflow Variables from GCP Secrets Manager (apache#7946)
59435bb Get Airflow Variables from Hashicorp Vault (apache#7944)
fe1a6a3 Get Airflow Variables from Environment Variables (apache#7923)
8905269 [AIRFLOW-6987] Avoid creating default connections (apache#7629)
1623b80 Make BaseSecretsBackend.build_path generic (apache#7948)
fe0a9d8 Fix CloudSecretsManagerBackend invalid connections_prefix (apache#7861)
008cb6e Standardize SecretBackend class names (apache#7846)
5ddff01 [AIRFLOW-7105] Unify Secrets Backend method interfaces (apache#7830)
19bcf78 [AIRFLOW-7104] Add Secret backend for GCP Secrets Manager (apache#7795)
cff559c [AIRFLOW-5705] Make AwsSsmSecretsBackend consistent with VaultBackend (apache#7753)
99bb2a7 [AIRFLOW-7076] Add support for HashiCorp Vault as Secrets Backend (apache#7741)
afae4b6 [AIRFLOW-5705] Fix bugs in AWS SSM Secrets Backend (apache#7745)
29015f5 [AIRFLOW-5705] Fix bug in Secrets Backend (apache#7742)
2a82f53 [AIRFLOW-5705] Add secrets backend and support for AWS SSM (apache#6376)

Available for testing at:

docker pull astronomerio/ap-airflow:1.10.7-10.dev-buster-onbuild

[codecov-io]

Codecov Report

Merging #573 into v1-10-7 will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           v1-10-7     #573   +/-   ##
========================================
  Coverage    10.80%   10.80%           
========================================
  Files          534      534           
  Lines        36397    36397           
========================================
  Hits          3932     3932           
  Misses       32465    32465           

Impacted Files	Coverage Δ
airflow/version.py	100.00% <100.00%> (ø)

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